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Obliquogobius trifasciatus sp. nov. (Teleostei: Gobiidae) is described on the basis of three specimens (29.5–30.5 mm in standard length) collected in the East China Sea, northwest of the Ryukyu Islands, southern Japan, in a depth of 115–124 m. The new species is characterized by the following combination of characters: 2nd dorsal and anal fins each with I, 9 rays; head moderate in size, its length 32.8–34.1% of standard length; lateral surface of nape scaled; postorbital pore G of cephalic sensory canal present; gill opening moderate in size, extending anteriorly to level with posterior margin of eye; pelvic fins united medially, with a well-developed connecting membrane (between innermost rays) and frenum (between spines); caudal fin dorsoventrally asymmetrical, lacking a distinct obliquely pointed tip, and with three lowermost branched rays much shorter than other branched rays; three broad black (dark brown in preserved specimens) bands, superposed by yellow chromatophores, on lateral surface of body, anteriormost band located under 1st dorsal-fin base, middle band just behind a vertical line through posterior end of 2nd dorsal-fin base, and posteriormost band on caudal-fin base; a small faint, yellow-tinged dusky blotch on center of caudal peduncle (between middle and posteriormost bands on body); a large black blotch, covering almost entirety of 1st dorsal fin; 2nd dorsal and caudal fins generally pale yellow, without a barred pattern. [ABSTRACT FROM AUTHOR]

A revised diagnosis is provided for the poorly known clingfish genus Lepadicyathus Prokofiev 2005. The genus belongs to Diademichthyinae (sensu Conway et al.) and is characterized by the following combination of characters: snout moderate in length, slightly pointed in lateral view; oral cleft very small, restricted to anterior tip of snout, posterior portion of both jaws covered by thick skin; gill membrane attached to isthmus; gill opening tiny, narrow slit, dorsal-most extent level with base of 12th or 13th pectoral-fin ray in lateral view; "single" adhesive disc, its size moderate, length 16.6–20.4% SL; center of disc flat, without cavity; disc papillae flattened, similar in size across disc surface; cephalic lateral-line canals moderately developed, including 2 nasal, 2 lacrimal and 2 postorbital pores; pre-opercular and mandibular lateral-line canals absent; anus situated about midway between posterior margin of disc and anal-fin origin (disc to anus length 45.8–55.5% of disc to anal-fin origin length); dorsal, anal, and caudal fins weakly connected by membrane with distinct notch between fins; premaxillae separated anteriorly by large circular gap in dorsal view; nasal bone long, anterior tip pointed, terminating close to anteromedial tip of premaxilla in dorsal view; few lower-jaw teeth (ca. 6), restricted to anterior ca. 1/4 of dentary; basibranchial elements (including cartilages) absent; caudal skeleton with upper and lower hypural plates, separated by narrow hypural diastema. As recognized herein, Lepadicyathus is monotypic and contains only Lepadicyathus minor (Briggs 1955), new combination. The species has previously been assigned to Lepadichthys Waite 1904 and represents a senior synonym of Lepadicyathus mendeleevi Prokofiev 2005, type species of Lepadicyathus. [ABSTRACT FROM AUTHOR]

Egglestonichthys fulmen sp. nov. (Teleostei: Gobiidae) is described on the basis of a single specimen (21.7 mm in standard length) collected from 250 m depth off Okinawa Island, Ryukyu Islands, Japan. The new species is characterized by the following combination of characters: anal-fin rays I, 9; pectoral-fin rays 17, lower rays not free from membrane; longitudinal scale series 25; transverse scales 8; pre-dorsalfin scale rows 8; cheek and opercle naked; pelvic frenum absent; caudal fin lanceolate, its length 32.2% of SL; interorbital width very narrow, 1.2% of HL (much narrower than pupil diameter); no spicules or odontoid processes on outer surface of gill arches; and body whitish, upper half with broken zigzag pattern of bright yellow patches and associated scattered black melanophores in fresh specimens (melanophores retained in preserved specimens). Several characters, including pectoral-fin ray count, interorbital width, and coloration uniquely distinguish the new species from congeners. [ABSTRACT FROM AUTHOR]

The poorly known blenny Alticus orientalis Tomiyama 1955 is considered a valid species and redescribed on the basis of 73 specimens (36 males and 37 females), 20.5–83.5 mm in standard length (SL). The species is characterized by the following combination of characters: dorsal-fin spines 14 (rarely 13); pectoral-fin rays 15 (very rarely 14 or 16); pelvic-fin rays I, 4; caudal-fin rays 12 (very rarely 11); supraorbital cirrus finely branched (except in specimens < ca. 20 mm SL); canine-like teeth absent on lower jaw; 1–9 small conical teeth on vomer (rarely secondarily lost); 3 (very rarely 2) pores in mandibular series; pre-anal-fin length 37.6–43.2 (mean 40.4) % SL in males, 39.9–46.9 (43.0) % SL in females; caudal-fin length 19.0–24.2 (21.8) % SL in males, 19.7–25.2 (22.4) % SL in females; pre-anal-fin length / caudal-fin length 1.6–2.2 (1.9) in males, 1.8–2.2 (1.9) in females; cheek without black spots; and head and pectoral fin without small black dots. Although A. orientalis is most similar to Alticus montanoi (Sauvage 1880) [all Japanese specimens previously identified as Alticus saliens (Lacepède 1800) are actually this species], it can be distinguished from the latter by the presence of teeth on the vomer, a greater number of pores in the mandibular series, greater pre-anal-fin length, and slightly shorter caudal-fin length. In addition, genetic analysis supports the divergence of A. orientalis from available sequences from other species of Alticus. In Japanese waters, A. orientalis is distributed around (and probably endemic to) the Izu and Ogasawara islands, whereas A. montanoi is distributed in the Ryukyu and Daito islands. [ABSTRACT FROM AUTHOR]

Lepadichthys conwayi, new species, is described on the basis of 42 specimens (13.0–42.0 mm in standard length [SL]) collected from the central South Pacific and characterized by the following combination of characters: head sensory canal pores well developed, including 2 nasal, lacrimal and postorbital, and 3 preopercular pores; 13–16 (modally 15, rarely 16) dorsal-fin rays; 11–14 (12, rarely 14) anal-fin rays; 27–30 (28) pectoral-fin rays; 8 or 9 (9), 8–11 (9), and 8–11 (9) gill rakers on first to third arches, respectively; upper end of gill membrane level with base of 7th to 10th (usually 9th) pectoral-fin ray in lateral view; disc length and width 15.0–17.1 (mean 16.0) and 11.1–16.1 (13.9) % SL, respectively, disc length plus disc width 27.8–33.2 (30.0) % SL; dorsal and anal fins with very weak membranous connections to (rarely separated from) caudal fin, posteriormost points of membranes usually just short of or just reaching vertical through caudal-fin base, otherwise very slightly beyond fin base; dorsal- and anal-caudal membrane lengths 3.4–7.1 (4.8) and 3.0–6.0 (4.8) % of caudal-fin length, respectively; black stripe on snout tip through eye to posterior region of head. In addition, examination of the type specimens of Lepadichthys springeriBriggs, 2001 revealed them to be conspecific with L. misakius (Tanaka, 1908), a valid species recently resurrected from the synonymy of L. frenatus Waite, 1904. Accordingly, L. springeri is regarded as a junior synonym of L. misakius. [ABSTRACT FROM AUTHOR]

Examination of the syntypes of Lepadogaster minimus Döderlein in Steindachner and Döderlein 1887 showed that species to be identical with Kopua japonica Moore, Hutchins and Okamoto 2012, although long been regarded as a valid species of Aspasma. A lectotype is designated for L. minimus (= Kopua minima), which is regarded as a senior synonym of K. japonica. A species commonly regarded as Aspasma minima is described as the new species Aspasma ubauo sp. nov., on the basis of 58 specimens from the Japanese mainland, and characterized by the following characters: 5–7 dorsal-fin rays; 6–8 anal-fin rays; 19–22 pectoral-fin rays; 4–6 gill rakers on each arch; head small, moderately depressed (dorsal profile flattened), its length 25.2–34.4% SL; mouth terminal; snout slightly pointed in lateral view; no subopercular spines; dorsal and anal fins well separated from caudal fin; single row (except anteriorly on premaxilla) of rectangular incisors in each jaw, lacking posteriorly hooked tips; large circular gap absent between anterior parts of premaxilla in dorsal view; disc size moderate, its length 15.8–20.6% SL; disc region D and anterior central portion of disc region A without flattened papillae; head sensory canal pores well developed, including 2 nasal, lacrimal and postorbital, and 3 preopercular pores; body without elongated spots or stripes. Morphological changes with growth and sexual dimorphism of the new species are also described. [ABSTRACT FROM AUTHOR]