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Cyclopecten cancellus Dijkstra, 1991 Figs 15H–I,K, 16 Cyclopecten cancellus Dijkstra, 1991: 21, figs 66–70; Dijkstra, 2001: 90, figs 33–35; Dijkstra & Moolenbeek, 2008: 18; Dijkstra & Maestrati, 2008: 97; Dijkstra & Maestrati, 2013b: 474. Type data. Holotype (lv) RMNH56560, 14 paratypes (v) RMNH56561–56566. Type locality: Indonesia, Flores Sea, off SW Salayer, 6°22.4'S 120°26.3'E, dead, 130–155 m (SNELLIUS-II stn 4.153). Additional material examined. — AUSTRALIA: QUEENSLAND: off Cairns, 16°36'12"– 16°35'54"S 146°15'24"– 146°14'18"E, dead, 110–201 m (1 v, C.165464). WESTERNAUSTRALIA: S of Cowaramup Bay, near mouth of Margaret River, 33°57'S 114°59'E, dead (2 v, C.165468); Kilcarnup, N side of Margaret River, 33°57'S 114°59'E, dead, beach (1 v, C.374666); Ellensbrook, 33°55'S 115°0'E, dead, beach (2 v, WAM S12952); Cowaramup, 33°52'S 115°0'E, dead (2 v [rudimentary internal riblets], WAM S12559; 1 v, WAM S12535); Rottnest Island, 32°0'S 115°30'E, dead, beach (9 v, WAM415.91); Rottnest Island, Bathurst Point, 32°0'S 115°30'E, dead, beach (1 v, WAM414.91); Rottnest Island, Ricey Beach, 32°0'S 115°30'E, dead, beach (3 v, WAM413.91; 1 v, C.165465); Cottesloe, Cable Station, 33°0'S 115°45'E, dead (1 v, WAM481.91); NW of Beagle Island, 29°43'S 114°17'E, dead, 274–283 m (1 v, C.165466). — NEW CALEDONIA: off New Caledonia, 20°16'S 169°51'E, alive, 85–100 m (2 pr, C.165234). Figure 16. Distribution of Cyclopecten cancellus Dijkstra (circles), C. horridus Dijkstra (star), C. powelli Dell (triangle) and C. reticulatus sp. nov. (squares). Description. Shell small, up to c. 3 mm high, convex, subcircular, opaque, whitish to cream, wider than high, inequivalve, almost equilateral, left valve slightly more convex than right, auricles almost equal in size, umbonal angle c. 100°. Left valve with coarse reticulate sculpture with scaly intersections, radial riblets (c. 10) more prominent than commarginal lamellae, both widely spaced, commencing at 0.5 mm shell height and increasing in prominence ventrally, with secondary interstitial radial riblets. Auricles with 1–2 radial riblets crossed by prominent commarginal lamellae. Right valve with closely spaced commarginal lamellae. Anterior auricle with 2–4 weak radial riblets, posterior smooth. Dorsal margin straight. Byssal notch moderately deep, byssal fasciole narrow. Habitat. Living in the sublittoral and bathyal zones amongst rubble on soft bottoms. Distribution. Indonesia, 130–375 m, dead; Vanuatu, 140–175 m, dead (Dijkstra, 1991, 2001); Fiji, 500–614 m, dead (Dijkstra & Maestrati, 2008). Now also from New Caledonia (85–100 m) and Australia (beach drift and 110–283 m, dead). Remarks. The present species is similar to the type specimens from Indonesia, although some specimens from Western Australia have some rudimentary internal riblets, which are lacking in typical specimens. Cyclopecten cancellus is a new record for Australia (empty shells only)., Published as part of Dijkstra, Henk H. & Beu, Alan G., 2018, Living Scallops of Australia and Adjacent Waters (Mollusca: Bivalvia: Pectinoidea: Propeamussiidae, Cyclochlamydidae and Pectinidae), pp. 113-330 in Records of the Australian Museum (Rec. Aust. Mus.) (Rec. Aust. Mus.) 70 (2) on page 149, DOI: 10.3853/j.2201-4349.70.2018.1670, http://zenodo.org/record/5299017

Cyclopecten kantori sp. n. Fig. 7A–G Etymology:After Dr Yuri I. Kantor, leading researcher of the Department of Invertebrate Morphology at the A.N. Severtzov Institute of Ecology and Evolution, Russian Academy of Sciences in Moscow. Participant of several French expeditions. Description: Shell up to 11.9 mm in height, fragile, subcircular, inequivalve, almost equilateral, left valve more inflated than right valve (nearlY flat), auricles dissimilar in shape, anterior auricle larger than posterior one, umbonal angle 120°, internal ribs lacking, semi-translucent whitish. Prodissoconch 220 µm long. Left valve reticulately sculptured throughout shell disc by narrow radial riblets and overrunning commarginal lirae with delicate solide nodules on intersections. On central part of disc c. 10 radial riblets per mm, c. 7–8 commarginal lirae. Reticular sculpture commences in early growth stage, radial riblets enlarge gradually in ontogeny by intercostal riblets towards the ventral margin. Commarginal lirae more prominent than radial riblets, very closely spaced in early growth stage, gradually wider in later ontogeny. Auricular sculpture similar to that of shell disc with stronger solid nodules on the intersections. Right valve sculptured with commarginal lirae, closely spaced (c. 30 per mm) near umbonal area, coarser and wider on central part of disc (c. 8 per mm). Posterior auricle continuous with shell disc, sculptured with fine close-set commarginal lirae, anterior auricle and byssal fasciole seperated from shell disc by sharply incised groove, sculptured with prominent commarginal lirae and 8 crowded radial riblets with nodular intersections. Byssal notch moderately deep, byssal fasciole narrow. Dimensions: Holotype: Height 11.9 mm, width 11.1 mm, convexity 3.2 mm. Type material: Holotype, pr (MNHN IM-2007-38440). Type locality: NW MADAGASCAR: In front of Narendry Bay (14°30'S 47°27'E), - 274–325 m, live, campaign Miriky, stn CP3241, 06.vii.2009. Distribution and habitat: So far northwestern Madagascar, living bathyally on soft substrata at - 274– 325 m. Remarks: The morphologically closest congeneric species is the abyssally (- 2928– 2930 m) living similar sized Cyclopecten textus Dijkstra & Marshall, 2008, recorded from the Lord Howe Rise. This species could be distinguished from C. kantori by the following characters: by shell shape (C. textus is almost circular, C. kantori somewhat higher than wide), by shape of auricles (C. textus has smaller auricles (c. 2 mm) measured between end of hinge and disc, C. kantori somewhat broader (2.5 mm)), by commarginal sculpture of the left valve (C. textus has less commarginal sculpture in early ontogeny, P. kantori more close-set), and by reticulate sculpture in the central part of the disc of left valve (C. textus more squarely, C. kantori more elongate). A somewhat similar reticulated sculptured bathyally living species is Parvamussium retiolum Dijkstra, 1995, recorded from the southwestern Pacific. This species could be easily distinguished from C. kantori by its more oblique elongate shape (C. kantori sub-circular), and by its well-developed internal ribs (lacking in C. kantori)., Published as part of Dijkstra, H. H. & Maestrati, P., 2015, Pectinoidea (Bivalvia: Propeamussiidae and Cyclochlamydidae) from the southwestern Indian Ocean, pp. 585 in African Invertebrates 56 (3) on pages 618-619, DOI: 10.5733/afin.056.0307, http://zenodo.org/record/7914533

Cyclopecten cassiculus sp. n. Fig. 6A–G Etymology: From the Latin cassiculus (m.) (small spider’s web), after the sculpture of left valve that resembles a spider’s web with fine raindrops on the intersections. Description: Shell up to 8.9 mm in height, fragile, lv opaque, rv semi-transparent, somewhat higher than wide, inequivalve, flattened and somewhat rough, left valve slightlY more convex than right valve, inequilateral, anterior auricle larger than posterior, umbonal angle 90°–95°, colour of left valve creamy, right valve whitish. Prodissoch 170 µm long. Left valve sculptured with very closely spaced commarginal lirae in early growth stage (c. 10 per mm), more prominent and widely spaced on central shell disc (c. 4–5 per mm), 8–10 fine radial lirae commence c. 0.8–1.0 mm below umbo, increasing to c. 15 strong primary lirae near periphery with interstitial secondary lirae, intersections with small nodules on primary radial lirae in early growth stage, more lamellar in adult stage, small nodules on secondary interstitial riblets, similar sculptured auricles almost continuous with shell disc. Right valve with very weak, regularly spaced, delicate commarginal lamellae (c. 10 per mm). Anterior auricle with 6–7 antimarginal noduliferous lirae, posterior auricle continuous with disc with verY fine and close-set commarginal lirae. Byssal notch moderately deep, byssal fasciole rather small, no ctenolium. Hinge line straight. Resilifer triangular. Internal ribs lacking. Dimensions (holotype): height 8.9 mm, width 8.0 mm, convexity 2.9 mm. Type material: Holotype, pr (MNHN IM-2007-41951), paratype, pr (MNHN IM-2007-41954).Type locality: MADAGASCAR: Near Mahajamba Bay (14°50'S 46°57'E), - 340–446 m, live, campaign Miriky, stn CP3248, RV Miriky, leg. P. Bouchet & Y. Kantor, 07.vii.2009. Paratype: MADAGASCAR: Between Majunga and Cap Saint-André (15°32'S 45°45'E), - 327–730 m, live, campaign Miriky, stn CP3265, RV Miriky, leg. P. Bouchet & Y. Kantor, 10.vii.2009. Distribution and habitat: NW Madagascar, living upper bathyally at - 327–340 m (minimum depth range). Remarks: The closest resembling species is Parvamussium cassium Dijkstra, 1991, recorded from deep water (- 450–600 m) off Indonesia. Cyclopecten cassiculus morphologically differs from P. cassium bY having prominent radial and fine commarginal lirae (in P. cassium weaker and more equal of prominence), in having secondary intercostal radial lirae in late ontogeny (P. cassium in earlier growth stage), in having fine interstitial radial lirae, up to 6 near ventral margin (one radial lira in P. cassium), and in having coarser nodules and lamellae on intersections of lirae (P. cassium very small nodules). Both species are lacking internal ribs, although P. cassium has a short auricular riblet (very weak in the present species). A somewhat resembling species is Parvamussium vidalense (Barnard, 1964), recorded from eastern South Africa and herein also from southern Madagascar. This species has a reticular sculpture on the left valve of more closelY spaced, finer radial and commarginal lirae with short spines or curved lamellae on the radial and commarginal intersections. Moreover, several rudimentary interior ribs are present (lacking in C. cassiculus)., Published as part of Dijkstra, H. H. & Maestrati, P., 2015, Pectinoidea (Bivalvia: Propeamussiidae and Cyclochlamydidae) from the southwestern Indian Ocean, pp. 585 in African Invertebrates 56 (3) on pages 616-617, DOI: 10.5733/afin.056.0307, http://zenodo.org/record/7914533, {"references":["BARNARD, K. H. 1964. Contributions to the knowledge of South African marine Mollusca. Part 5. Lamellibranchiata. Annals of the South African Museum 47: 361 - 593."]}

Cyclopecten kapalae Dijkstra, 1990 Cyclopecten kapalae Dijkstra, 1990: 29, figs 1-5. MATERIAL EXAMINED. — Australia. New South Wales, off Sydney, 914- 907 m, holotype spm (AMS C.155831.1). Vanuatu. SANTO 2006, stn AT19, 15°40.8’S, 167°00.5’E, 503-600 m, 6 lv, 4 rv. — Stn DB69, 15°24.4’S, 167°13.0’E, 38 m, 1 spm. DISTRIBUTION. — Eastern Australia, Solomon Islands, Vanuatu (new record) and Kermadec Islands. Earlier known from 512-549 m (Dijkstra & Maestrati 2008: 97), the Santo specimen live collected in 38 m shows that this is a shallow offshore species., Published as part of Dijkstra, Henk H. & Maestrati, Philippe, 2012, Pectinoidea (Mollusca, Bivalvia, Propeamussiidae, Cyclochlamydidae n. fam., Entoliidae and Pectinidae) from the Vanuatu Archipelago, pp. 389-408 in Zoosystema 34 (2) on page 393, DOI: 10.5252/z2012n2a12, http://zenodo.org/record/5165513, {"references":["DIJKSTRA H. H. 1990. - A new species of scallop from off New South Wales, Australia (Bivalvia: Propeamussiidae). Journal of the Malacological Society of Australia 11: 29 - 32.","DIJKSTRA H. H. & MAESTRATI P. 2008. - New species and new records of deep-water Pectinoidea (Bivalvia: Propeamussiidae, Entoliidae and Pectinidae) from the South Pacific, in HEROS V., COWIE R. H. & BOUCHET P. (eds), Tropical deep-sea benthos, volume 25. Memoires du Museum national d'Histoire naturelle 196: 77 - 113."]}

Cyclopecten cancellus Dijkstra, 1991 Cyclopecten cancellus Dijkstra, 1991: 21, figs 66-70. MATERIAL EXAMINED. — Indonesia. Off SW Salayer, 130-155 m, holotype lv (RMNH 56560). Vanuatu. SANTO 2006, stn ZB06, 15°36.8’S, 167°01.3’E, 30 m, 1 spm. — Stn EP10, 15°34.5’- 38.0’S, 167°05.1’-13.6’E, 45-101 m, 1 spm. — Stn NB12, 15°33.1’S, 167°09.6’E, 20 m, 1 spm, 3 lv, 1 rv. — Stn AT14, 15°23.7’-24.0’S, 167°12.9’-13.5’E, 102-120 m, 1 lv, 1 rv. — Stn EP19, 15°37.5’-38.0’S, 167°05.1’-05.6’E, 80-94 m, 2 lv.— Stn DB20, 15°30.5’S, 167°01.4’E, 22-25 m, 1 spm. — Stn EP21, 15°37.7’S, 167°05.2’E, 99 m, 1 spm. — Stn ZS22, 15°33.1’S, 167°09.6’E, 27-29 m, 1 lv. — Stn EP36, 15°33.1’- 33.3’S, 167°12.4’-12.7’E, 20-60 m, 1 spm. — Stn EP40, 15°33.1’-33.6’S, 167°16.4’-16.5’E, 125-156 m, 1 spm. — Stn FB43, 15°28.4’S, 167°14.9’E, 19 m, 1 lv, 2 rv. — Stn FP50, 15°36.8’S, 167°08.7’E, 25 m, 1 spm. — Stn DB63, 15°26.9’S, 167°15.8’E, 21 m, 1 rv. — Stn DB77, 15°27.9’S, 167°14.7’E, 42-45 m, 1 spm. — Stn FS77, 15°33.1’S, 167°09.6’E, 29 m, 3 lv, 2 rv. — Stn DB80, 15°37.1’S, 167°07.5’E, 18 m, 1 lv. — Stn DS99, 15°32.5’S, 167°16.9’E, 100-105 m, 1 spm, 3 lv, 1 rv. — Stn DS102, 15°34.1’S, 167°16.0’E, 98-100 m, 1 spm, 2 lv, 1 rv. — Stn DS103, 15°34.1’S, 167°16.0’E, 70-80 m, 3 lv, 2 rv. — Stn DS105, 15°33.0’S, 167°16.7’E, 92 m, 3 lv. DISTRIBUTION. — Indonesia, Vanuatu and Fiji. Bathymetric range: earlier known from shells in 130-614 m; Santo specimens collected alive in 20-125 m. REMARKS The Santo specimens are indistinguishable from the type material. The rudimentary internal riblets are very variable, i.e. lacking (typically) one or several short rudimentary., Published as part of Dijkstra, Henk H. & Maestrati, Philippe, 2012, Pectinoidea (Mollusca, Bivalvia, Propeamussiidae, Cyclochlamydidae n. fam., Entoliidae and Pectinidae) from the Vanuatu Archipelago, pp. 389-408 in Zoosystema 34 (2) on page 393, DOI: 10.5252/z2012n2a12, http://zenodo.org/record/5165513, {"references":["DIJKSTRA H. H. 1991. - A contribution to the knowledge of the pectinacean Mollusca (Bivalvia: Propeamussiidae, Entoliidae, Pectinidae) from the Indonesian Archipelago. Zoologische Verhandelingen 271: 1 - 57."]}

Cyclopecten bavayi Dijkstra, 1990 Figs 32, 33 Cyclopecten (Cyclopecten) bavayi Dijkstra, 1990a: 5, fig. 9. MATERIAL EXAMINED. — Solomon Islands. SALOMON 1: stn CP 1781, 08°31’S, 160°38’E, 1036-1138 m, 1 spm (Figs 32, 33). DISTRIBUTION. — Indonesia, shells in 835 m (Dijkstra 1990a: 5). New record for the Solomon Islands. Present specimen live in 1036-1138 m. REMARKS. — The present specimen from the Solomons is nearly indistinguishable from the type material, although the commarginal and intercalated radial sculpture of the left valve are slightly more widely placed in the present specimen. Other morphological characters are extremely similar., Published as part of Dijkstra, Henk H. & Maestrati, Philippe, 2008, New species and new records of deep-water Pectinoidea (Bivalvia: Propeamussiidae, Entoliidae and Pectinidae) from the South Pacific, pp. 77-114 in Mémoires du Muséum national d'Histoire naturelle 196 on page 97, {"references":["DIJKSTRA H. H. 1990 a. - Three new pectinacean species from the Indonesian Kermadec Islands. Molluscan Research 18: 73 - 114."]}