Japanese shortnose spurdog

materials_examined

(9 specimens) ZUMT 7630 (holotype of Squalus brevirostris), adult male, 426 mm TL, Japan, Tokyo fish market; CSIRO H 6293 - 29, juvenile female, 404 mm TL, Taiwan, near I-Lan (NE coast), Tashi fish market; CSIRO H 6483 - 02, adult male, 450 mm TL, off Kasasa, Kagoshima, Japan, East China Sea, 31 ° 29 ̸ N, 130 ° 0 2 ̸ E; HUMZ 95065, adult female, 465 mm TL, East China Sea, 26 ° 14.7 ̸ N, 124 ° 42.5 ̸ E; HUMZ 189762, adult male, 403 mm TL, East China Sea; HUMZ 189767, neonate male, 275 mm TL, East China Sea; KAUM-I 185, juvenile female, 500 mm TL, KAUM- I 187, adult female, 578 mm TL, KAUM-I 377, adult male, 377 mm TL, East China Sea, Japan, Kagoshima, off Kasasa, 31 ° 29 ̸ N, 130 ° 0 2 ̸ E.

Redescription of Squalus acutipinnis Regan, 1908, a Valid Species of Spiny Dogfish from Southern Africa (Chondrichthyes: Squaliformes: Squalidae)

description

Squalus acanthias Chile Pacific Ocean GN 2399 Squalus megalops Australia Indian Ocean GN 4976 100 Squalus megalops Australia Indian Ocean GN 4974 97 Squalus megalops Australia Pacific Ocean GN 2620 97 Squalus megalops Australia Pacific Ocean GN 4975 Squalus cf. megalops South Africa Indian Ocean GN 7166 87 Squalus cf. megalops South Africa Indian Ocean GN 7165 100 95 Squalus cf. megalops Angola Atlantic Ocean GN 7115 74 Squalus cf. megalops South Africa Indian Ocean GN 7167 SqualusSqualus brevirostrisbrevirostris GN 10047 HOHO 160160 99 Squalus brevirostris Japan Pacific Ocean GN 4996 58 Squalusq brevirostris Japanp Pacific Ocean GN 4995 58 SqualusSSqualusq brevirostrisbrevirostris GN 10048 HO HO 161 161 58 SqualusSqualus brevirostrisbrevirostris GN 10075 HO 188 100 Squalus crassispinus Australia Indian Ocean GN 4965 100 Squalus crassispinus Australia Indian Ocean GN 4966 99 Squalus crassispinus Australia Indian Ocean GN 4967 Squalus edmundsi Australia Indian Ocean GN 4970 100 Squalus edmundsi Australia Indian Ocean GN 4968 89 Squalus edmundsi Australia Indian Ocean GN 4969 Squalus nasutus Australia Indian Ocean GN 4983 97 Squalus nasutus Australia Indian Ocean GN 4984 81 100 Squal

A DNA sequence-based identification checklist for Taiwanese chondrichthyans

description

Description. External morphology. Small size species (147.0 - 578.0 mm TL) of Japanese dogfish. Body fusiform and slender, equally deep from head to trunk (head height 0.9, 0.9 - 1.0 times trunk height and 1.0, 0.8 - 1.2 times abdomen height) (Fig. 5 A-C). Head very short, its length 21.9 % (20.0 % - 29.6 %) TL; head width 1.4 (1.0 - 1.4) times broader than trunk width and 1.1 (1.1 - 1.6) times abdomen width. Snout somewhat obtuse ventrally, very short (preorbital length 6.7 %, 6.5 % - 7.5 % TL); anterior nasal flap broad and bifurcated, nearer to snout tip than to mouth with prenarial length 0.8 (0.8 - 0.9) times distance from nostril to upper labial furrow (Fig. 5 D-F). Eyes oval with anterior margin rounded and posterior margin notched; eyes large, its length 2.3 (1.8 - 2.5) times its height. Prespiracular length 0.6 (0.5 - 0.6) times prepectoral length and 1.8 (1.6 - 1.9) times preorbital length. Spiracle crescent and narrow, its length 0.3 (0.3 - 0.4) times eye length, nearer to posterior margin of the eye than to first gill slit. First and fifth gill slits somewhat concave and low; fifth gill slit 1.1 (0.9 - 1.6) times higher than first gill slit. Preoral length somewhat equa

Squalus shiraii sp. nov. (Squaliformes, Squalidae), a new species of dogfish shark from Japan with regional nominal species revisited

diagnosis

Diagnosis. A small-sized (373 - 578 mm TL in adults) Squalus species that differs from its Japanese congeners by: snout conspicuously short, its prenarial length 4.0 %, 3.8 % - 4.3 % TL (vs. 5.4 % - 5.6 % TL for S. shiraii sp. nov. vs. 4.1 % - 5.6 % TL for S. mitsukurii vs. 5.9 % - 6.8 % TL for S. japonicus vs. 4.7 % - 5.1 % TL for S. acutirostris); dermal denticles unicuspid and lanceolate; pectoral-fin free rear tips conspicuously pointed; more elongate pectoral fins with its inner margin length 10.3 %, 9.8 % - 11.2 % TL (vs. 7.3 % - 8.3 % TL for S. shiraii sp. nov. vs. 7.7 % - 9.5 % TL for S. mitsukurii vs. 7.5 % - 8.8 % TL for S. japonicus vs. 7.3 % - 8.7 % TL for S. suckleyi vs. 6.6 % - 8.3 % TL for S. acutirostris). It is further separated from S. japonicus and S. shiraii sp. nov. by narrower internarial space (3.6 %, 3.4 % - 3.8 % TL vs. 4.1 %, 4.1 % - 4.7 % TL for S. japonicus vs. 4.8 %, 4.1 % - 4.8 % TL for S. shiraii sp. nov.) and from S. shiraii sp. nov. by larger second dorsal and pelvic fins (second dorsal-fin inner margin length 5.0 %, 4.8 % - 5.7 % TL and pelvic fin length 11.7 %, 10.9 % - 13.6 % TL vs. 3.6 %, 3.2 % - 4.1 % TL and 10.7 %, 9.5 % - 10.7 % TL for S. shi

Squalus shiraii sp. nov. (Squaliformes, Squalidae), a new species of dogfish shark from Japan with regional nominal species revisited