Bathygadus furvescens Alcock 1894
Creators: name: Iwamoto, Tomio
name: Nakayama, Naohide
name: Shao, Kwang-Tsao
name: Table, Hsuan-Ching Ho
Publisher: name: Zenodo
Year: 2015
Subjects: Biodiversity
Taxonomy
Animalia
Chordata
Gadiformes
Macrouridae
Bathygadus
Bathygadus furvescens

description: Bathygadus furvescens Alcock, 1894
Figures 1A–B.
Bathygadus furvescens Alcock, 1894:128 (holotype ZSI F13047, “ 20.5 inches ” [ca. 52 cm]; off Maldives, Investigator sta. 150; 719 fm [1,315 m]).— Gilbert and Hubbs, 1920:388–391 (descr.; 5 spec., 5 loc., Philippine and Indonesia; 565–976 fm [1033–1785 m]).— Iwamoto and Merrett, 1997:479 (validated position of species in Bathygadus).— Iwamoto and Graham, 2001:422–423, fig. 17 (descr., 10 spec., se. coast Australia, “depths between 1,000 and 1, 240 m ”).— Shao et al., 2008: table 2 (2 spec., SET, first record for Taiwan).
MATERIAL EXAMINED (10 spec).— SET: ASIZP 65510 (1, 91.8 HL, 475+ TL); CP 127, 1263– 1268 m. Others questionably assigned to species, but with black head and abdomen, lacking paler areas on head: SET: ASIZP 66938 (1, 475 TL); CP 127, 1263–1268 m. SWT: ASIZP 66115 (1, 100 HL, 450 TL); CD 322, 1098 m; ASIZP 70215 (1, 345 TL); ASIZP 63788 (4, 118+-380+ TL); CD 192, 1305 m; ASIZP 65530 (2, 280–335 TL); CD 134, 736– 1040 m.
DISTINGUISHING FEATURES.— A species of Bathygadus with no scales on gular membrane; chin barbel absent; dorsal profile slightly elevated over nape; 1D II,8–10; P i15–i19; V 8–9; gill-rakers outer arch (5–6) + (18–20); pyl. caeca 20–22. Interorbital width 26–30% HL; orbit diameter 21–23%; suborbital width 14–15%; postorbital length 51–55%; distance orbit to preopercle 48–50%; length upper jaw 56–59%; length P 61–81%; length V 67–83%; length longest gill-raker 13–15%. Fins well developed; outer V ray elongated and distally filamentous. Flesh and head bones relatively firm. Fins black to dark dusky. (After Iwamoto and Graham [2001:479] except for lengths of postorbital and longest gill-raker, the ranges of these were extended by our specimens.)
DISTRIBUTION.— Recorded from Maldives, Indonesia, Philippines, se. Australia, and now off Taiwan, in depths between approximately 1000 m and 1800 m.
REMARKS.— Howes and Crimmen (1990:195) treated the species as a member of Gadomus based on a specimen they erroneously considered a syntype, but which not only was non-type material but also a species different from the holotype (see Iwamoto and Merrett 1997:479). The large Taiwan specimen was similar in most mensurable and count characters to the specimens we called B. antrodes. However, its head bones were stouter, integument notably tougher, with scale pockets well developed, color overall paler, the interorbital width slightly narrower (27–28% HL), and none of the fin rays longer than the head. The specimen agreed in these respects with B. furvescens as circumscribed by Iwamoto and Graham (2001:422–423) and represents the first record of the species from Taiwan waters.
description: Published as part of Iwamoto, Tomio, Nakayama, Naohide, Shao, Kwang-Tsao & Table, Hsuan-Ching Ho, 2015, Synopsis of the Grenadier Fishes (Gadiformes; Teleostei) of Taiwan, pp. 31-126 in Proceedings of the California Academy of Sciences 62 (3) on page 38, DOI: 10.5281/zenodo.11512126