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Rapturella atlas n. sp. (Figure 1) Type material. Holotype MZSP 91018 (Fig. 1 A���B). Paratypes: BRAZIL, Rio de Janeiro state, Cape S��o Tom��, 21��58.32' S 40��02.05' W, 155 m, MZSP 107499, 1 shell (18.vi.2005); S��o Paulo state, S��o Sebasti��o, 24��44'69" S 44��44'965" W, 153 m, MZSP 107496 (Fig. 1 C���F), 1 shell, MZSP 107497, 1 shell, MNHN 25271, 2 shells, MNRJ 30855, 2 shells; 24��42.8' S 44��42.9' W, 162 m, MZSP 107498, 2 shells (20.xi.1997); 25��14.4' S 45��03.1' W, 147 m, MZSP 107500, 4 shells (21.xi.1997). Type locality. BRAZIL: Rio de Janeiro, off Cape S��o Tom��, 22��00.708' S 40��03.380' W, 162 m (Project Frade Development, sta BC_A_E39_1, C.H. Caetano coll., 29.vi.2005). Etymology. In honors of Atlas, the nick name of Frank Fontaine, the character of the science-fiction video game series BioShock: an allusion to the hidden identity of the species. The noun in apposition. Diagnosis. Small shell with walls strongly thickened. Umbilicus deep and narrow. Spiral grooves on teleoconch separated by regularly spaced intervals, each interval about 10 times wider than the grooves; last whorl has about 11 spiral grooves, but no subsutural grooves. Palatal region has no thickened area. Description. Shell oval, profile rounded, maximum length (L) 3.1 mm; about 1.3 times longer than wide. Walls thickened. Color white; spire short, length about 1/4 of total length (Fig. 1A, B). Protoconch small, glossy, 1 whorl; width about 0.4 mm; separated from teleoconch by narrow orthocline furrow (Fig. 1F: arrows). Teleoconch up to 4 whorls, each whorl convex (Fig. 1C). Surface smooth, glossy, sculptured with narrow punctuated spiral grooves distributed on entire teleoconch; punctuations very small, oval (Fig. 1D); grooves regularly spaced, separated by gaps about 10 times wider than grooves; last whorl with about 11 spiral grooves, gradually becoming deeper and closer to each other towards umbilical area; 3 grooves on anterior half and 8 on posterior half; umbilicus rimate, partially covered by extension of columellar margin. Aperture about 2/3 of total length, antero-posteriorly elongated, length about 1.5 times width; posterior end pointed, anterior (siphonal) rounded. Inner lip concave; superior half convex, rounded, with thin callus, about 1.3 times length of inferior half; inferior half slightly concave, with shallow edge, and small thickened columellar fold in posterior region. Outer lip thick, with sharp edge. Measurements (length by width in mm). Holotype: 2.8 by 1.6 (Fig. 1 A���B). Paratypes: MZSP 107496 (Fig. 1 C���F), 1 shell, 3.1 by 2.2; MZSP 107497, 1 shell, 2.6 by 1.7; MZSP 107498, 1 shell, 2.7 by 1.8; MZSP 107500, 3 shells, (#1) 2.3 by 1.5, (#2) 1.7 by 1.3, (#3) 2.3 by 1.6; MZSP 138843, 1 shell, 2.7 by 1.8; MNHN 25271, 2 shells, (#1), 2.0 by 1.4, (#2) 2.5 by 1.7; MNRJ 30855, 2 shells, (#1) 1.8 by 1.3; (#2) 2.5 by 1.7; MZSP 90698, 1 shell, 3.3 by 2.2; MZSP 91018, 1 shell, 2.6 by 1.7. Distribution. Rio de Janeiro to S��o Paulo, Brazil. Habitat. Muddy sand bottom, 147���162 m depth. Material Examined. Types. Remarks. Rapturella atlas n. sp. fits in the genus Rapturella because it presents most of the diagnostic features of the genus including a minute shell size with thick walls, rounded spire whorls with a subsutural shelf, a teleoconch sculptured by spiral grooves composed of rounded punctae, and the characteristic aperture with a rounded trapezoidal shape, a columellar region thickened with a weak fold, a narrow anal canal, and a rounded siphonal canal region. Rapturella atlas n. sp. most resembles R. ryani, from the Florida Keys, USA. It differs by having a smaller size (length up to 2.5 mm, while R. ryani easily reaches 4 mm); thicker walls forming a more solid shell; 3 spiral grooves on the penultimate whorl (5 more closely spaced grooves on R. ryani), about 3 grooves in the periumbilical region (about 10 more closely spaced grooves on R. ryani), and a smaller protoconch (0.42 mm, against 0.47 mm of R. ryani). Despite it being a smaller species, the smaller protoconch of R. atlas is a relevant developmental parameter. Rapturella atlas n. sp. differs from R. globulina (Forbes, 1884), from the Eastern Atlantic (Salvador & Cunha, 2016), by its slightly rounded whorls forming a straighter profile (whorls of R. globulina are more rounded), the small subsutural shoulder on each whorl (absent on R. globulina), and by the more widely spaced spiral grooves on its shell surface. Additionally, R. atlas n. sp. differs from its congeners in lacking two closely spaced, punctate, subsutural grooves (Salvador & Cunha 2016: fig. 4C, F), and in lacking a faint tooth-like thickening on the palatal region. This discovery expands the geographic distribution of the genus Rapturella southwards to the southwest Atlantic region off the Brazilian coast. However, the distribution of the genus remains restricted, like that of the genera Callostracon Repetto & Bianco, 2012 and Mysouffa Marcus, 1974, to the Atlantic and Mediterranean. This conforms to the heterogenic distribution of acteonids, with most genera confined to specific regions such as the subarctic (e.g. Neactaeonina Thiele, 1912), the Pacific (e.g. Pseudactaeon Thiele, 1925 and Maxacteon Rudman, 1971) or the Western Atlantic (e.g. Ovulactaeon Dall, 1889). Only the genus Acteon has a more widespread range, but, with species of such diverse shell shapes (e.g. Rudman 1971; Marcus 1974; Vald��s 2008), further taxonomic investigation may result in its segregation into more genera. The new species, as well as the genus Rapturella, are recognized only by a combination of few conchological characters. The lack of soft tissue samples inhibits any comparative morphological evaluations or molecular analyses. Thus, the putative relationships of the genus with other acteonids and the classification of the species, which we here assign to Rapturella, need to be tested once new quality samples become available., Published as part of Cunha, Carlo M. & Simone, Luiz Ricardo L., 2018, A new species of the genus Rapturella (Gastropoda: Acteonidae) from southeast Brazil, pp. 125-128 in Zootaxa 4521 (1) on pages 125-126, DOI: 10.11646/zootaxa.4521.1.7, http://zenodo.org/record/2609721, {"references":["Salvador, R. B. & Cunha, C. M. (2016) Taxonomic revision of the fossil genera Bulimactaeon, Hemiauricula (= Liocarenus) and Nucleopsis, with description of a new Recent genus and species (Gastropoda: Heterobranchia: Acteonidae). Journal of Molluscan Studies, 82 (3), 472 - 483. https: // doi. org / 10.1093 / mollus / eyw 010","Marcus E. (1974) On some Cephalaspidea (Gastropoda: Opisthobranchia) from the western and middle Atlantic warm waters. Bulletin of Marine Science, 24, 300 - 371.","Rudman W. B. (1971) The family Acteonidae (Opisthobranchia, Gastropoda) in New Zealand. Journal of the Malacological Society of Australia, 2, 205 - 214.","Valdes A. (2008) Deep-sea \" cephalaspidean \" heterobranchs (Gastropoda) from the tropical southwest Pacific. In: Heros, V., Cowie, R. H. & Bouchet, P. (Eds.), Tropical Deep-Sea Benthos. Vol. 25. Memoires du Museum National d'Histoire Naturelle, 196, pp. 587 - 792."]}

Rapturella Salvador & Cunha, 2016 Type species. Tornatella globulina Forbes, 1844 by original designation., Published as part of Cunha, Carlo M. & Simone, Luiz Ricardo L., 2018, A new species of the genus Rapturella (Gastropoda: Acteonidae) from southeast Brazil, pp. 125-128 in Zootaxa 4521 (1) on page 125, DOI: 10.11646/zootaxa.4521.1.7, http://zenodo.org/record/2609721, {"references":["Salvador, R. B. & Cunha, C. M. (2016) Taxonomic revision of the fossil genera Bulimactaeon, Hemiauricula (= Liocarenus) and Nucleopsis, with description of a new Recent genus and species (Gastropoda: Heterobranchia: Acteonidae). Journal of Molluscan Studies, 82 (3), 472 - 483. https: // doi. org / 10.1093 / mollus / eyw 010"]}

Elachisina Dall, 1918 Type species. Elachisina grippi Dall, 1918 by original designation. Recent, North America., Published as part of Cunha, Carlo M., Santos, Franklin N. & Lima, Silvio F. B., 2016, New species of the genus Elachisina (Gastropoda: Elachisinidae) from northeastern Brazil, pp. 131-134 in Zootaxa 4139 (1) on page 131, DOI: 10.11646/zootaxa.4139.1.9, http://zenodo.org/record/272008

Elachisina colellai n. sp. (Figure 1) Type material. Holotype MZSP 107714. Paratypes MZSP 107716, 2 shells. All from type locality. Type locality. BRAZIL: Bahia, Itaparica Island, 1985, J. Colella coll. Etymology. In honor to Julio Colella, an enthusiastic Brazilian conchologist who collected the material studied here. Diagnosis. Shell small, translucent, ovate-conical profile. Protoconch paucispiral, 1/2 whorl, smooth, separation from teleoconch sharp, with a narrow orthocline scar. Teleoconch globose, sculptured by rather equally spaced, weak slight spiral threads, crossed axially by irregular growth lines. Last whorl rounded. Columellar region arched. Umbilicus narrow, delimited by very slight, blunt rim. Description. Shell small (SH 1.8���2.5 mm), thin, translucent, ovate-conical profile (Figs 1 A, C); SW/SH 0.60���72; spire height (0.8���1.0 mm) about 2/3 SH, spire whorls rounded, suture distinct. Protoconch 1/2 whorl (sensu Verduin 1977), 0.34 mm wide, smooth, separation from teleoconch sharp (narrow orthocline scar) (Fig. 1 B). Teleoconch globose, 3 roundly inflated whorls, which increase rapidly in size; sculptured by rather equally spaced, weak spiral threads, crossed axially by irregular faint growth lines (Fig. 1 E). Penultimate and last whorls with about 10 and about 16 spiral threads, respectively. Suture well marked, channeled (Fig. 1 D). Last whorl rounded, about 1/2 SH. Columellar region slightly arched; base ornamented with about 18 spiral threads. Aperture large, moderately narrow, anteriorly rounded, AW/AH 0.53���0.60, AH/SH 0.56���0.61; parietal region about 1/2 AH, with sharp angulation in highest part, slightly convex; columellar region slightly concave about 1/2 AH; inner lip smooth, thin, weakly deflected (Fig. 1 A); outer lip smooth, thin, moderately curved (Fig. 1 A). Umbilicus narrow, moderately deep, sculptured with few fine threads; axial thread may be present coming into the umbilicus through the middle; umbilical area delimited by very slight, blunt rim (Fig. 1 A). Measurements. Holotype: MZSP 107714 ��� SH = 1.8 mm, SW = 1.3 mm, AH = 1.0 mm, AW = 0.6 mm; paratypes (2): MZSP 107716���SH = 2.5 mm, SW = 1.5 mm, AH = 1.5 mm, AW = 0.8 mm; SH = 1.9 mm, SW = 1.5 mm, AH = 1.0 mm, AW = 0.7 mm. Distribution. Known only from type locality. Habitat. Unknown. Material Examined. Types. Remarks. This family was established by Ponder (1985) based on a unique combination of anatomical characters of the species Elachisina floridana. The anatomy of the family can be summarized as having a bilobed snout; foot with an anterior pedal gland, a metapodial tentacle arising from its bilobed posterior end; a pair of pallial tentacles; long, slender, ciliated, parallel-sided cephalic tentacles with the eyes on swellings at their outer bases; a large ctenidium with low triangular filaments; an oval osphradium; a well-developed hypobranchial gland and a bursa copulatrix located in the pallial roof (Ponder 1985; Ponder & Keyzer 1998). Members of this family (e.g. Elachisina) have shell morphology very similar to rissoellids (e.g. Rissoella), differing in having usually numerous spiral grooves and threads on the teleoconch as observed in Rol��n & Rubio (2001). Elachisinids of the genera Elachisinia, Dolicrossea Iredale, 1924 and Pseudocirsope O. Boettger, 1907 ��� have a very similar combination of conchological characters. The presence of an umbilicus bordered by a slight keel/ridge/rim and sculptured inside with an axial thread are the striking features in species of Elachisina (Rol��n & Rubio 2001; Rol��n & Gofas 2003). Dolicrossea and Pseudocirsope differ from Elachisina mainly in having a strong ridge/cord bordering the umbilicus (Finlay 1930; Muller 2011). Furthermore, there is a strongly projecting, twisted cord bordering the umbilicus and a short siphonal canal in members of Dolicrossea (Finlay 1930). Laeviphitus van Aartsen, Bogi & Giusti, 1989 differs from these three genera of elachisinids mainly by the rissoiform shell, usually with a minutely granular surface and cancellate protoconch (War��n & Bouchet 2001). The general shell morphology of the new species resembles the Western Atlantic Elachisina floridana and Eastern Atlantic E. canaliculata Rol��n & Rubio, 2001, E. canarica, E. pelorcei Rol��n & Gofas, 2003 and E. senegalensis Rol��n & Gofas, 2003. However, E. colellai n. sp. clearly differs from these congeners by its paucispiral protoconch with less than one whorl (Fig. 1 B), whereas previously described Elachisina have protoconch with a little more than one up to two whorls (see Rol��n & Rubio 2001; Rol��n & Gofas 2003). Another important feature of the new species is the moderately narrow aperture measuring about 60% of the total length of shell and having a sharper angulation in the adapical part. The aperture of other Atlantic Elachisina is enlarged, ovate-pyriform, and about 50% of the total length of shell and with a greater adapical angulation (e.g. E. canaliculata, E. canarica, E. floridana, E. pelorcei and E. senegalensis) (Rol��n & Rubio 2001; Rol��n & Gofas 2003). Elachisina colellai n. sp. also differs in having the umbilical region delimited by a very slight, blunt rim, while E. canaliculata, E. canarica and E. floridana have a well-delineated umbilical rim (see Rol��n & Rubio 2001; Rol��n & Gofas 2003). Elachisina colellai n. sp. and E. floridana live sympatrically in northeastern Brazil. The new species also differs from E. floridana in having slight spiral threads on the teleoconch and the antero-posteriorly elongated aperture with slightly curved inner and outer lip. Elachisina floridana has a dense and distinctive sculpture formed by regular spiral threads and grooves on the teleoconch whorls and a pyriform aperture with more broadly curved outer and inner lips (Ponder 1985: fig. 6B���C; Rol��n & Gofas 2003: figs 1���2, 4���5). Furthermore, the last whorl is largely rounded, and the upper part of the inner lip is not separated from the parietal wall and is expanded on the lower part in E. colellai n. sp. In contrast, E. floridana has a globose last whorl, and the upper part of the inner lip is slightly separated from the parietal wall (Ponder 1985: fig. 6B���C; Rol��n & Gofas 2003: figs 1���2, 4���5)., Published as part of Cunha, Carlo M., Santos, Franklin N. & Lima, Silvio F. B., 2016, New species of the genus Elachisina (Gastropoda: Elachisinidae) from northeastern Brazil, pp. 131-134 in Zootaxa 4139 (1) on pages 131-133, DOI: 10.11646/zootaxa.4139.1.9, http://zenodo.org/record/272008, {"references":["Verduin, A. (1977) On a remarkable dimorphism of the apices of sympatric closely-related marine gastropod species. Basteria, 41 (5 - 6), 91 - 95.","Ponder, W. F. (1985) The anatomy and relationships of Elachisina Dall (Gastropoda Rissoacea). Journal of Molluscan Studies, 51 (1), 23 - 34.","Ponder, W. F. & Keyzer, R. G. (1998) Superfamily Rissooidea. In: Beesley, P. L., Ross, G. J. B. & Wells, A. (Eds.), Mollusca: The Southern Synthesis. Fauna of Australia. Vol 5, Part B viii. CSIRO Publishing, Melbourne, pp. 745 - 766.","Rolan, E. & Rubio, F. (2001) New species of the genera Elachisina and Rissoella (Mollusca, Gastropoda) from the Cape Verde Archipelago. Novapex, 2 (4), 133 - 136.","Rolan, E. & Gofas, S. (2003) The family Elachisinidae (Mollusca, Rissooidea) in the temperate and tropical Atlantic. Iberus, 21 (2), 67 - 90.","Finlay H. J. (1930) New Shells from New Zealand Tertiary Beds. Part 3. Transactions of the New Zealand Institute, 61, 49 - 84.","Muller, A. (2011) Der Steinbruch Mammendirf NW Magdeburg - ein Felslitoral der unteroligozanen Nordsee. Journal of Central European Geology, 57, 3 - 120.","Waren, A. & Bouchet, P. (2001) Gastropoda and Monoplacophora from hydrothermal vents and seeps new taxa and records. The Veliger, 44 (2), 116 - 231."]}

Cranopsis apostrema new species Figures 56���65 Types. Holotype MNHN 25300. Paratypes: MNHN 25301, 25 shells, MZSP 105509, 10 shells, MNRJ 25961, 4 shells; all from type locality. Brazil. Esp��rito Santo; continental slope of Abrolhos (MD 55; Bouchet, Leal & M��tivier col.; 27 /v/ 1987); off Ita��nas, 18 �� 59 ���S 37 �� 48 ���W, 607���620 m, MNHN 25302, 3 shells (sta. DC 73), 18 �� 58 ���S 37 �� 48 ���W, 682 m, MNHN 25303, 1 shell (sta. SY 74); off Reg��ncia, 19 �� 40 ���S 37 �� 48 ���W, 790���940 m, MNHN 25304, 1 shell (sta. CB 77). Rio de Janeiro; Campos Basin, 22 �� 42 ���33.8���S 40 �� 40 ���84.2���W, 110���120 m, MNRJ 17234, 1 shell (19 /ix/ 2009). Type locality. Brazil. Esp��rito Santo; off Ita��nas, continental slope of Abrolhos, 18 �� 59 ���S 37 �� 50 ���W, 295 m (MD 55 sta. DC 75; Bouchet, Leal & M��tivier col., 27 /v/ 1987). Diagnosis. Apex curved posteriorly, located in middle level in profile. Height ca. 45 % of length; width 66 % of length. Sculptured by 53 radial cords, with pustules. Foramen flanked by low edges; located high on shell. Description. Shell size ca. 5 mm; bluntly conical; height ca. 45 % of length. Pure white. Protoconch of 1.5 rounded whorls (Fig. 60, 65); situated on right (Figs 57, 59); smooth, glossy; size 240 ��m. Foramen cuneiform (pointed anteriorly), width 13 % of length; located dorsally, preceding anterior slope; ca. 6 % of shell width, ca. 25 % of shell length; edges irregular (Figs 56, 61, 63). Groove anterior to fissure very narrow; flanked by cords of similar strength as neighbor cords. Beak curved dorso-posteriorly, located anterior to posterior 1 / 3 of shell length (in dorsal view), in middle of shell height in profile; teleoconch of one whorl, overall angle in lateral view ca. 110 �� (Figs 57, 59, 62, 64). Sculpture of ca. 53 (range 50���55) narrow primary radial cords (Figs 56���57, 59 ��� 64), with small pustules; gradually increasing in strength towards aperture; in ventral half secondary cords gradually appearing; each pustule separated from neighboring pustules in line by space ca. 1 / 2 of its width; interspaces ca. twice as wide as cord; ca. 60 pustules along threads close to median line. Selenizone short, narrower than foramen; edges simple, low; smooth internally (Figs 56, 61, 63). Aperture planar (Figs 57, 59, 64) to slightly concave (Fig. 62); outline elliptical, width approximately 66 % of length; edges smooth. Inner surface smooth, glossy (Fig. 58). Septum ca. 40 % of shell height; twice as high as wide, ventral edge slightly concave, ca. 25 % of aperture width; gradually narrowing up to posterior edge of fissure. Measurements (in mm). Holotype: 4.8 by 2.5; Paratype MZSP 105509 # 1: 4.8 by 2.5 (Figs 61���62). Distribution. Continental slope off Esp��rito Santo to Rio de Janeiro, Brazil. Habitat. Sandy mud bottoms, 110���940 m (dead specimens). Material examined. Types. Etymology. The specific epithet is derived from the Greek, apo, meaning separate, and extrem, related to strike; an allusion to delicate radial sculpture of the shell., Published as part of Simone, Luiz Ricardo L. & Cunha, Carlo M., 2014, Taxonomical study on the mollusks collected in Marion-Dufresne (MD 55) and other expeditions to SE Brazil: the Fissurellidae (Mollusca, Vetigastropoda), pp. 437-468 in Zootaxa 3835 (4) on page 448, DOI: 10.11646/zootaxa.3835.4.2, http://zenodo.org/record/249622

Cranopsis enigmatica new species Figures 42���47 Types. Holotype MNHN 25297 (Figs 42���44). Paratypes: MNHN 25298, 1 shell, MZSP 102941, 1 shell (Figs 45���47); all from type locality. Type localit y. Brazil. Esp��rito Santo; off Reg��ncia, continental slope of Abrolhos, 19 �� 40 ���S 37 �� 48 ���W, 790���940 m (MD 55, sta. CB 77; Bouchet, Leal & M��tivier col, 27 /v/ 1987). Diagnosis. Apex curved backwards, located in dorsal region in profile. Height ca. 80 % of length; width 74 % of length. Sculptured by ca. 50 radial cords, with triangular pustules. Foramen flanked by elevated, projected edges; located totally turned towards dorsal. Description. Shell size approximately 2.8 mm; slender, bluntly conical; height ca. 80 % of length. White, translucent. Protoconch of one rounded whorl (Fig. 43); situated on right, smooth, glossy; diameter ca. 110 ��m. Foramen elliptical (slightly tapering anteriorly), width 27 % of length; located dorsally, preceding anterior slope; width of foramen 9 % of shell width; length of foramen 26 % of shell length; edges irregular (Figs 42, 46). Groove anterior to foramen very narrow; flanked by pair of cords twice as wide as neighboring radial primary cords (Fig. 42). Beak curved ventrally, located preceding posterior 1 / 5 of shell length (in dorsal view); teleoconch of 1.3 whorls, overall angle ca. 65 �� (Figs 43, 45). Sculpture of ca. 50 narrow radial cords (Figs 42, 43, 45���47), composed of aligned, small, narrowly triangular pustules (Fig. 47); primary cords gradually increasing in size, being stronger close to aperture; secondary cords gradually appearing in adapertural half, being slightly narrower, lower; pustules slightly elevated, triangular, with base wider, scale-like, narrowly touching neighbor pustules in line; interspaces between cords ca. 1.5 times their width; ca. 45 pustules along median threads. Selenizone well-marked, narrower than foramen; edges slightly higher than radial cords, continuation from those of foramen, with sharp edges; lunules well-spaced (Fig. 46). Aperture planar (Figs 43, 45), outline elliptical, width 74 % of length; edges simple. Inner surface smooth, glossy (Fig. 44). Septum ca. 60 % of shell height; twice as high as wide; ventral edge straight, 48 % of aperture width; gradually narrowing to posterior edge of fissure. Measurements. Holotype 2.8 by 2.0 mm; Paratype MZSP 102941 (SEM) 2.3 by 1.6 mm. Distribution. Known only from type locality. Habitat. Sandy mud bottoms, 790���940 m (dead specimens). Material examined. Types. Etymology. The specific epithet is derived from the Greek word aenigma, meaning enigmatic, something obscure; an allusion to the similarity of the species with other congeners, being its differentiation an enigma., Published as part of Simone, Luiz Ricardo L. & Cunha, Carlo M., 2014, Taxonomical study on the mollusks collected in Marion-Dufresne (MD 55) and other expeditions to SE Brazil: the Fissurellidae (Mollusca, Vetigastropoda), pp. 437-468 in Zootaxa 3835 (4) on pages 444-445, DOI: 10.11646/zootaxa.3835.4.2, http://zenodo.org/record/249622

Genus Cornisepta McLean & Geiger, 1998 Type species. Fissurisepta antarctica Egorova, 1972 (OD), Published as part of Simone, Luiz Ricardo L. & Cunha, Carlo M., 2014, Taxonomical study on the mollusks collected in Marion-Dufresne (MD 55) and other expeditions to SE Brazil: the Fissurellidae (Mollusca, Vetigastropoda), pp. 437-468 in Zootaxa 3835 (4) on page 439, DOI: 10.11646/zootaxa.3835.4.2, http://zenodo.org/record/249622, {"references":["McLean, J. H. & Geiger, D. J. (1998) New genera and species having Fissurisepta shell form, with a generic-level phylogenetic analysis (Gastropoda: Fissurellidae). Los Angeles County Museum of Natural History Contributions in Science, 475, 1 - 32.","Egorova, E. N. (1972) Biological results of the Soviet Antarctic expeditions. 7. Mollusca of the Davis Sea. Explorations of the Faunas of the Seas, 26, 1 - 142."]}

Profundisepta denudata new species Figures 109–115 Types. Holotype MZSP 105507. Paratypes: MZSP 105508, 4 shells from type locality. Type locality. Brazil. São Paulo; continental slope off Ubatuba, 24 ° 12 ’S 40 ° 23 ’W, 3049 m (R/V W. Besnard, PI, 01/vi/ 1971, A. Birman leg.). Diagnosis. Height ca. 80 % of length. Outer surface slightly sculptured by ca. 120 faint radial cords, and concentric, delicate undulations. Protoconch smooth, glossy. Description. Shell size ca. 3 mm; broadly conical; slightly arched posteriorly (Figs 110, 114); height ca. 80 % of length. White, translucent, light beige apex (Figs 111, 115). Protoconch white, of 1.5 rounded whorls (Figs 114, 115); situated on right (Figs 109, 111), forming posterior apex of foramen; smooth, glossy; size 320 µm. Foramen subterminal, diamond-shaped, width ca. 50 % of length; dorsally located – slightly turned anteriorly; ca. 10 % of aperture area; edges rather irregular (Figs 109, 111). Teleoconch conical; angle ca. 55 °. Sculpture weak; minute, thin mosaic of small pustules aligned in radial rows (Figs 110, 114), ca. 120 rows of pustules close to aperture, secondary cords (with about half shell height) intercalated between primary alignments; distance of neighboring pustule on the rows approximately half of the width of the pustule; interspaces between rows as wide as rows. Commarginal undulations distinct (Figs 109–112). Aperture planar (Figs 110, 114), elliptical, width ca. 85 % of length; edges somewhat regular. Inner surface smooth, glossy (Figs 112, 113). Septum ca. 50 % of shell height (Fig. 115); about as tall as wide; ventral edge slightly concave, 42 % of aperture width; gradually narrowing to posterior edge of foramen, constituting posterior and ventral floor of foramen (Fig. 111). Measurements (in mm). Holotype: 3.0 by 2.2; paratype MZSP 105508: # 1, 2.8 by 2.7, 2 #, 3.1 by 3.3. Distribution. Continental slope off São Paulo, Brazil. Habitat. ca. 3000 m (dead specimens). Material examined. Types. Etymology. The specific epithet is from Latin denudo, denudatus, meaning bare, uncovered, an allusion to the outer surface of shell lacking strong radial sculpture. Remarks. Profundisepta denudata differs from P. profundi (Jeffreys, 1877) (McLean & Geiger, 1998: figs 3 A–C), and from other congeneric species from North Atlantic [P. alicei (Dautzenberg & Fischer, 1897); P. bo r ro i (Farfante, 1947); P. sportella (Watson, 1883)] (McLean & Geiger 1998), by the weak radial sculpture, the concentric undulations, and in being slender; the remaining shell features are similar. Profundisepta denudata differs from P. alicei (McLean & Geiger 1998: figs 3 H–I), from the Azores and the Iberian-Moroccan Gulf, in being wider, having weaker radial sculpture, by the blunt shape of the posterior edge of foramen, and by the larger protoconch.

Genus Puncturella Lowe, 1827 Type species. Patella noachina Linnaeus, 1771 (M)., Published as part of Simone, Luiz Ricardo L. & Cunha, Carlo M., 2014, Taxonomical study on the mollusks collected in Marion-Dufresne (MD 55) and other expeditions to SE Brazil: the Fissurellidae (Mollusca, Vetigastropoda), pp. 437-468 in Zootaxa 3835 (4) on page 459, DOI: 10.11646/zootaxa.3835.4.2, http://zenodo.org/record/249622, {"references":["Lowe, R. T. (1827) On Balanus punctatus, Puncturella Flemingii, & c.; together with some corrections relative to Turbo carneus, and some of the Chitones before described. Zoological Journal, 3, 76 - 80."]}

Genus Emarginula Lamarck, 1801 Type species. E. conica Lamarck, 1801; M, Published as part of Simone, Luiz Ricardo L. & Cunha, Carlo M., 2014, Taxonomical study on the mollusks collected in Marion-Dufresne (MD 55) and other expeditions to SE Brazil: the Fissurellidae (Mollusca, Vetigastropoda), pp. 437-468 in Zootaxa 3835 (4) on page 453, DOI: 10.11646/zootaxa.3835.4.2, http://zenodo.org/record/249622, {"references":["Lamarck, J. B. P. M. (1801) Systeme des Animaux sans Vertebres. Paris, viii, 432 pp."]}

Cranopsis columbaris new species Figures 84���89 Types. Holotype MZSP 107719. Paratypes: MZSP 105520, 3 shells from type locality. Type locality. Brazil. Cear��, off Fortaleza, Canopus bank, 2 �� 12 ��� 43 ���S 38 �� 18 ��� 52 ���W, 250 m (Coltro col., viii/ 2005). Diagnosis. Apex curved posteriorly, dorsal-located. Height 68 % of length; width 70 % of length. Sculpted by ca. 30 radial, low cords, with rather triangular pustules; interspaces twice cords��� width. Foramen with tall edges; located dorsally. Description. Shell size up to 2.8 mm; tall, cone-like; height 68 % of length. White-translucent, with minute white-opaque pits in interspaces of radial sculpture (Figs 84, 85). Protoconch one rounded whorl (Figs 86, 89); situated on right; smooth, opaque; ca. 170 ��m. Foramen cuneiform (pointed anteriorly), width ca. 30 % of length; located dorsally, preceding anterior slope; 9 % of shell width, 22 % of shell length; edges regular, thick (Figs 85, 87), projected dorsally as short wings. Groove anterior to foramen very narrow; flanked by pair of cords similar sized as neighboring cords; length 84 % of shell height (Fig. 85, 87). Shell profile conical, apex curved posteriorly, in dorsal quarter of shell height, located between middle and posterior thirds (in dorsal view); teleoconch of 1.2 whorls (Figs 84, 86). Sculpture of ca. 30 radial cords (Figs 84���87, 89), with small, rather triangular pustules (longer axis radially arranged); cords gradually increasing in width towards aperture (Fig. 89); ca. 10 primary cords, in ventral half secondary cords gradually appearing; pustules slightly elevated, scale-like, twice as long as wide, connected with neighboring pustules of same radial line by narrow folds; interspaces between successive radial cords ca. 3 times their width; ca. 40 pustules along cords close to median line. Selenizone short, narrow, shallow, anterior part as wide as foramen, 33 % of shell length (Figs 85, 87). Aperture planar (Figs 84, 86), outline elliptical, width ca. 70 % of length; edges slightly denticulated by radial sculpture. Inner surface smooth, glossy (Fig. 88); narrow furrow located in front of fissure, fainting at short distance from anterior edge (Figs 87, 88). Septum ca. 60 % of shell height; ca. 3 times higher than wide; ventral edge somewhat straight, 41 % of aperture width (Fig. 88); gradually narrowing up to posterior edge of fissure (Figs 84, 87). Measurements (in mm). Holotype = 2.8 by 1.9 mm. Distribution. Continental slope off Cear��, Brazil. Habitat. Sandy bottoms with debris, 250 m (dead specimens). Material examined. Types. Etymology. The specific epithet is derived from Latin columbar-is, meaning collar, an allusion to the shell sculpture, looking like a necklace with radially arranged stones., Published as part of Simone, Luiz Ricardo L. & Cunha, Carlo M., 2014, Taxonomical study on the mollusks collected in Marion-Dufresne (MD 55) and other expeditions to SE Brazil: the Fissurellidae (Mollusca, Vetigastropoda), pp. 437-468 in Zootaxa 3835 (4) on page 452, DOI: 10.11646/zootaxa.3835.4.2, http://zenodo.org/record/249622

Emarginula suspira new species Figures 90���102 Emarginula tuberculosa: Leal, 1991: 41 (pl. 2, fig. F); Rios, 2009: 27 (fig. 49) (part) (non Libassi, 1859). Emarginula sp 1: Leal, 1991: 42 (fig. 2 G). Types. Holotype MNHN 25310. Paratypes: MNHN 25311, 16 shells, MZSP 102932, 5 shells, MZSP 102939, 2 shells, MNRJ 25959, 3 shells, all from type locality. Brazil. Esp��rito Santo (MD 55; Bouchet, Leal & M��tivier col); off Ita��nas, continental slope of Abrolhos, 18 �� 59 ���S 37 �� 48 ���W, 607���620 m, MNHN 25312, 5 shells (sta. DC 73; 27 / v/ 1987); off Reg��ncia, 19 �� 40 ���S 37 �� 48 ���W, 790���940 m, MNHN 25313, 2 shells, MZSP 102921, 1 shell (sta. CB 77; 27 /v/ 1987); off Concei����o da Barra, 18 �� 58 ���S 37 �� 49 ���W, 637 m, MNHN 25314, 1 shell (sta. CB 76; 27 /v/ 1987); Jaseur Seamount, 20 �� 27 ���S 35 �� 54 ���W, 54 m, MNHN 25315, 1 shell (sta. DC 34; 15 /v/ 1987); Montague Seamount, 20 �� 26 ���S 36 �� 41 ���W, 310���350 m, MNHN 25316, 1 shell (sta. CB 79; 14 /v/ 1987). Type locality. Brazil. Esp��rito Santo; off Ita��nas, continental slope of Abrolhos, 18 �� 59 ���S 37 �� 50 ���W, 295 m (MD 55 sta. DC 75; Bouchet, Leal & M��tivier col., 27 /v/ 1987). Diagnosis. Apex greatly curved inwards, located posteriorly, close to posterior apertural lip. Height ca. 40 % of length. Sculpted by ca. 40 radial cords, regularly interrupted by concentric, less developed cords, forming nodes at intersections; mostly alternating wide and narrow cords. Slit ca. 30 % of shell length. Description. Shell size up to 7 mm; low, limpet-like; height ca. 40 % of length. Pure white (Figs 93���95), ca. 10 % of specimens with some pale beige pigmentation. Protoconch of 1.5 rounded whorls (Figs 91, 92); situated on right (Figs 94, 97); smooth, glossy; size 230 ��m. Slit anterior, rectangular, width ca. 20 % of length; opened anteriorly; ca. 8 % of shell width and ca. 30 % of shell length; edges rather irregular (Figs 93, 95, 96, 98, 99). Profile highly curved ventrally, sagittal profile as arc (imaginary center of ark located below middle point of dorsal surface, ca. 20 % away from aperture) (Figs 94, 97); beak located close to posterior margin of aperture. Sculpture of ca. 40 narrow radial cords (Figs 90, 93, 97, 99���101); gradually more distinct towards aperture, wide and narrow cords disposed intercalating, narrow cords ca. 1 / 2 ��� 1 / 4 of wider cords (Figs 90, 93, 96, 99); concentric cords regularly distributed from apex to aperture (Figs 100���101), ca. 1 / 2 to 1 / 3 width of primary radial cords; nodes at intersection of radial and concentric cords low in some specimens (Fig. 99), but frequently forming spine-like projections about as thick as cords (Figs 90, 93, 96); interspaces twice as wide as primary cords, covered by concentric sculpture; interval between concentric sculpture approximately twice as wide as threads; median threads with ca. 40 concentric cords; well preserved specimens with periostracum forming additional transverse, wide pits in concavity formed by radial and concentric cords (Fig. 99). Selenizone well-marked, edges sharp, as tall as adjacent radial cords; lunules regularly distributed (Figs 90, 93, 96, 99. 100). Aperture planar (Fig. 94) to slightly concave (Fig. 97), outline elliptical, width ca. 70 % of length; edges undulating due to radial cords; posterior lip flattened, planar, ca. 20 % of shell length; mostly convex (Fig. 95), rarely concave (Fig. 98). Inner surface smooth, glossy; apex cavity moderately deep, ca. 20 % of shell length (Figs 95, 98, 102). Measurements (in mm). Holotype: 6.8 by 2.9; paratypes MNHN 25311 (Fig. 96): 3.9 by 1.6; MNHN 25315 (sta. 34, Fig. 99): 2.7 by 1.4; MZSP 102932: # 1, 5.0 by 2.7 (Fig. 90), # 2, 4.0 by 1.7 (Figs 100���102). Distribution. Continental slope off Esp��rito Santo, Brazil. Habitat. Sandy-mud bottoms, 54���940 m (dead shells). Material examined. Types. Etymology. The specific epithet is derived from the Portuguese word suspiro, a special dessert, a candy done with egg albumin and sugar; an allusion to general appearance of the shell somewhat resembling this delicate candy. The noun is in apposition., Published as part of Simone, Luiz Ricardo L. & Cunha, Carlo M., 2014, Taxonomical study on the mollusks collected in Marion-Dufresne (MD 55) and other expeditions to SE Brazil: the Fissurellidae (Mollusca, Vetigastropoda), pp. 437-468 in Zootaxa 3835 (4) on pages 453-455, DOI: 10.11646/zootaxa.3835.4.2, http://zenodo.org/record/249622, {"references":["Leal, J. H. (1991) Marine Prosobranch Gastropods from Oceanic Islands off Brazil. Universal Book Services. Dr. W. Backhuys. Oegstgeest, 419 pp.","Rios, E. C. (2009) Compendium of Brazilian Sea Shells. Universidade Federal do Rio Grande. Rio Grande, 668 pp.","Libassi, I. (1859) Sopra alcune conchiglie fossile dei intorni de Palermo. Reale Academia di Scienze, Lettere i Belle Arti di Palermo, Atti (n. s.), 3, 1 - 47."]}

Genus Profundisepta McLean & Geiger, 1998 Type species. Puncturella profundi Jeffreys, 1877 (OD)., Published as part of Simone, Luiz Ricardo L. & Cunha, Carlo M., 2014, Taxonomical study on the mollusks collected in Marion-Dufresne (MD 55) and other expeditions to SE Brazil: the Fissurellidae (Mollusca, Vetigastropoda), pp. 437-468 in Zootaxa 3835 (4) on page 457, DOI: 10.11646/zootaxa.3835.4.2, http://zenodo.org/record/249622, {"references":["McLean, J. H. & Geiger, D. J. (1998) New genera and species having Fissurisepta shell form, with a generic-level phylogenetic analysis (Gastropoda: Fissurellidae). Los Angeles County Museum of Natural History Contributions in Science, 475, 1 - 32.","Jeffreys, J. G. (1877) New and peculiar species of Mollusca procured in the Valourous expedition. Annals and Magazine of Natural History, Series 4, 19, 231 - 243."]}

Puncturella volcano new species Figures 116���120 Types. Holotype MNHN 25328. Type locality. Brazil. Esp��rito Santo; off Ita��nas, continental slope of Abrolhos, 18 �� 59 ���S 37 �� 48 ���W, 607���620 m (MD 55 sta. DC 73; Bouchet, Leal & M��tivier col, 27 /v/ 1987). Diagnosis. Slightly curved posteriorly. Height ca. 35 % of length. Outer surface sculptured by weak irregular, radial, low lines, sometimes coalescing, ca. 70 (close to aperture). Foramen shorter than half shell height. Description. Shell size ca. 4 mm; high-conical, slightly arched posteriorly (Fig. 117); height ca. 35 % of length. White, translucent. Protoconch lost. Foramen terminal, oval, width 41 % of length; turned dorsally; 2 % of aperture area; edges rather irregular (Figs 116, 120). Teleoconch widening towards aperture; total shell angle ca. 110 ��. Sculpture almost smooth, except for weak sculpture of irregular radial lines (Figs 116���117), ca. 70 close to aperture, arranged in mosaic of coalescing, divergent lines (Fig. 117); mosaic crowded towards apex, retaining the same number of radial lines from dorsal to ventral; lines surrounded by smooth interspaces as wide as lines. Aperture slightly concave, elliptical, width 74 % of length; edges irregular. Inner surface smooth, glossy (Figs 118���119). Septum slightly curved (concavity posterior), ca. 1 / 2 of shell height; about as high as wide, ventral edge straight, with ca. 30 % of aperture width; narrowing up to posterior edge of foramen, forming posterior, ventral floor of foramen (Fig. 120). Measurements (in mm). Holotype: 3.8 by 1.3. Distribution. Only known from type locality. Habitat. Sandy bottoms, 607���620 m (dead specimen). Material examined. Holotype. Etymology. The specific epithet is derived from the English word volcano, an allusion to the appearance of the shell. Remarks. The generic attribution of P. volcano is based on the loss of the protoconch, and by the rounded shape of the fissure (following definition by Farfante 1947). An attribution to the genus Fissurisepta Seguenza, 1862 to P. v o l c a no is not plausible because it is lower, more curved backwards at the apex, the foramen is wider and more elongated, and the sculpture is not so developed. The low shell profile and the weak shell sculpture distinguish this species from any other congeneric species in the Atlantic, which have stronger radial ribs or threads. The species differs from P. sportella Watson, 1883, in lacking radial pits or ribs, and by the shorter septum., Published as part of Simone, Luiz Ricardo L. & Cunha, Carlo M., 2014, Taxonomical study on the mollusks collected in Marion-Dufresne (MD 55) and other expeditions to SE Brazil: the Fissurellidae (Mollusca, Vetigastropoda), pp. 437-468 in Zootaxa 3835 (4) on page 459, DOI: 10.11646/zootaxa.3835.4.2, http://zenodo.org/record/249622, {"references":["Farfante, I. P. (1947) The genera Zeidora, Nesta, Emarginula, Rimula and Puncturella in the Western Atlantic. Johnsonia, 2, 93 - 148.","Seguenza, G. (1862) Paleontologia malacologica dele roce terziarie del discreto di Messina studiata nei suoi rapporti zooloogici e geognostici. Annali dell'Accademia degli Aspiranti Naturalisti, Serie 3, 2, 77 - 95.","Watson, R. B. (1883) Mollusca of H. M. S. ' Challenger' Expedition. Part XIX. Zoological Journal of the Linnean Society, 17, 320 - 340."]}

Hemimarginula hemitoma new species Figures 140–151 Emarginula pumila: Métivier, 1972: 412; Rios et al, 1987: 11 (fig. 37); Leal, 1991: 41 (pl. 2, Figs D-E); Rios, 2009: 26 (fig. 48) (part) (non Adams, 1851). Types. Holotype MNHN 25324. Paratypes: MNHN 25325, 1 shell, MZSP 102947, 2 shells from type locality. Brazil. Espírito Santo (MD 55; Bouchet, Leal & Métivier col); off Itaúnas, continental slope of Abrolhos, 18 ° 56 ’S 37 ° 52 ’W, 85–105 m, MNHN 25326, 4 shells, MZSP 102948, 3 shells (sta. DC 82; 28 /v/ 1987); Jaseur Seamount, 20 ° 27 ’S 35 ° 54 ’W, 54 m, MNHN 25327, 1 shell (sta. DC 34; 15 /v/ 1987); Trindade Island, Enseada dos Portugueses, 20 ° 30 ’ 15 ”S 29 ° 18 ’ 46 ”W, 10–12 m, MNHN 25881, 3 shells (sta. 1; Bouchet col., v/ 1987), Andradas beach, 20 ° 30 ’ 50 ”S 29 ° 18 ’ 20 ”W, 0–1 m, MZSP 101247, 1 shell (Simone col. 24 /vii/ 2011). Type locality. Brazil. Espírito Santo; off Itaúnas, continental slope of Abrolhos 18 ° 50 ’S 37 ° 57 ’W, 60 m (MD 55, sta. DC 83; Bouchet, Leal & Métivier col. 28 /v/ 1987). Diagnosis. Apex blunt, located in middle, turned postero-dorsally. Height 40–60 % of length. Sculpted by 50–60 strong radial cords, mostly alternating wide and narrow cords, interspaces regularly filled by minute transverse cords. Description. Shell size ca. 5 mm; conical, limpet-like; height 40–60 % shell length. Color beige to pale brown, sometimes with some radial white spots (Figs 144, 145). Protoconch mostly eroded, located laterally, situated on right (Figs 145, 147). Slit anterior, rectangular, width ca. 30 % of length; opened anteriorly; 6 % of shell width and 8–16 % of shell length; edges rather irregular (Figs 140, 144, 146). Profile highly curved dorso-ventrally, sagittal profile slightly conical; general angle ca. 90 °; apex blunt, curved ventrally, located in posterior 1 / 5 – 1 / 3 (Figs 141, 145, 147, 150). Strong sculpture of radial threads (Figs 140–148, 150), 50–60 surrounding apex; gradually increasing in width towards aperture, intercalated wide and narrow cords, varying from ca. 1 / 3 (Figs 140–141) to ca. 1 / 2 of threads (Figs 143, 146); in ca. 10 % of specimens some radial threads much larger and pale pigmented (Figs 144–145); interspaces between cords one half cords width, filled by transverse narrow cords, ca. 1 / 6 of threads width, ca. 40 scales along cords close to median line (Figs 140, 143, 146, 147). Selenizone weak, low, edges low and inconspicuous; filled by sparse lunules (Figs 140, 143, 144, 146). Aperture flat, outline elliptical, width ca. 75 % of length; edges undulating due to radial cords. Inner surface smooth, glossy; horseshoe-shaped scar of shell muscle, located between middle and ventral thirds from apex to edge (Figs 142, 149); with series of minute pits, regularly spaced, radially aligned (Figs 149, 151), ca. 40 pitted lines approximately organized in pairs. Measurements (in mm). Holotype: 4.6 by 2.8; paratypes MZSP 102947 # 1: 3.7 by 1.3 (Fig. 144); # 2: 3.1 by 1.7 (Fig. 146). Distribution. Brazil; Espírito Santo, Vitória-Trindade seamount ridge. Habitat. Coralline and rocky bottoms, 1–105 m (dead specimens). Material examined. Types. Etymology. The specific epithet is related to the appearance to the slitless fissurellid genus Hemitoma Swainson, 1840. Remarks. The strong sculpture and the short slit of H. hemitoma are the main characters for the generic attribution, rather than to Emarginula, which mostly encompasses species with higher and more delicately sculptured shells. Hemimarginula hemitoma is similar to H. dentigera (Heilprin, 1889), from the Caribbean, the type species of the genus, in having some specimens with irregular colored ribs and by the strong radial sculpture (Figs 144, 145). It differs from the latter in being taller (height/length ratio: 40–60 %, versus 27 % in H. dentigera), and by the double-lined, radial pits on outer surface (Figs 143, 146, 147). The delicate radially arranged pits and the narrower radial ribs also distinguish this species from other north Caribbean congeners such as H. pumila (A. Adams, 1851) and H. pileum (Heilprin, 1889) (McLean 2011); H. hemitoma has a comparable height to H. pileum, which has a height/length ca. 1 / 2. The sculpture of H. hemitoma is only comparable to that of H. biangulata (Sowerby, 1901) from Japan, differing by the more rounded shape and more posterior apex. Hemimarginula dentigera has been referred as occurring in Brazilian coast (as Emarginula pumila: see McLean 2011, for a discussion). Analyzing the figures and voucher material in MZSP, it is here suggested that those reports actually belong to H. hemitoma (see synonymy above). However, some specimens, e.g., from Cairu, Bahia (5 m) (MZSP 100991), possibly belong to H. dentigera, as the specimen has a low shell and lacks radial pits between radial sculpture. The real distribution of H. dentigera and H. hemitoma requires further investigation. The presence of aligned series of pits in the inner shell surface (Figs 149, 151) appears to be a novelty for the genus. The pits possibly are related to aesthetes (Salvini-Plawén & Haszprunar 1987 on other vetigastropods), which need to be confirmed in live-collected specimens.

Cranopsis nymphalis new species Figures 31���39 Types. Holotype MNHN 25293. Paratypes: MNHN 25294, 19 shells, MZSP 107717, 1 shell (Figs 37���39), MZSP 102927, 14 shells, MNRJ 25958, 5 shells, all from type locality. Brazil. Esp��rito Santo; continental slope of Abrolhos (MD 55; Bouchet, Leal & M��tivier col.; 27 /v/ 1987); off Ita��nas, 18 �� 59 ���S 37 �� 48 ���W, 607���620 m, MNHN 25295, 2 shells (sta. DC 73); off Reg��ncia, 19 �� 40 ���S 37 �� 48 ���W, 790���940 m, MNHN 25296, 1 shell (sta. CB 77). Type locality. Brazil. Esp��rito Santo; off Ita��nas, continental slope of Abrolhos, 18 �� 59 ���S 37 �� 50 ���W, 295 m (MD 55 sta. DC 75; Bouchet, Leal & M��tivier col., 27 /v/ 1987). Diagnosis. Apex curved downwards, located close to apertural level. Height 47 % of length; width ca. 80 % of length. Sculpted by ca. 40 strong radial ribs, relatively narrow, profile rounded, bearing transverse low scales extending to narrow interspaces of ribs. Fissure flanked by low, thread-like edges; located close to anterior edge, not completely separated from edge. Description. Shell size up to 10 mm, low, limpet-like; height 47 % of length. Pure white. Protoconch of 1.5 rounded whorls (Fig. 35); situated to right at posterior edge of apex (Figs 35���36); smooth, glossy; size 250 ��m. Foramen cuneiform (pointed anteriorly), width ca. 12 % of length; located anteriorly, barely open (possibly juveniles); 7 % of shell width, 42 % of shell length; edges irregular (Figs 31, 32, 34). Profile with beak curved ventrally, located on posterior edge (in dorsal view) (Fig. 33); teleoconch of one whorl; profile highly curved ventrally, sagittal profile as ark (center in middle level of dorsal surface, ca. 10 % ventrally off aperture; Figs 33). Sculpture of ca. 40 regular primary radial ribs (Figs 32, 33), with rounded profile; secondary ribs initially rather fine, gradually increasing to size of primary ribs at margin; transverse, semilunar, low nodes as thickenings at intersection with radial sculpture, disposed along ribs in regular spaces equivalent to ca. 1 / 2 of ribs��� width; nodes continuing between ribs forming series of squared pits; interspaces between successive radial ribs ca. 1 / 3 their width; ca. 60 scales along ribs close to median line. Selenizone well-marked, as wide as fissure; edges barely taller than radial ribs, continuation from those of fissure, with sharp edges (Figs 37, 38); lunules well-spaced (Figs 31���32). Aperture planar (Fig. 33) elliptical in outline, width ca. 80 % of length; edges undulating by radial sculpture. Inner surface smooth, glossy (Fig. 34); bearing several minute, radially aligned pits (Fig. 39). Septum very small, ca. 5 % of shell height; as long as wide, ventral edge slightly concave, ca. 8 % of aperture width; transforming into simple projected posterior edge of fissure (Figs 31, 32, 34, 39). Measurements (in mm). Holotype: 7.2 by 5.0; Paratype MZSP 107717: 3.1 by 1.5 (Figs 37���39). Distribution. Known only from type locality. Habitat. Sandy mud bottoms, 295���940 m depth (dead specimens). Material examined. Types. Etymology. The specific epithet is derived from Greek, nympha, meaning bride, maiden spirit supposed to inhabit the sea and other natural places; an allusion to special, pretty radial sculpture of the shell., Published as part of Simone, Luiz Ricardo L. & Cunha, Carlo M., 2014, Taxonomical study on the mollusks collected in Marion-Dufresne (MD 55) and other expeditions to SE Brazil: the Fissurellidae (Mollusca, Vetigastropoda), pp. 437-468 in Zootaxa 3835 (4) on pages 443-444, DOI: 10.11646/zootaxa.3835.4.2, http://zenodo.org/record/249622