Gadomus magnifilis Gilbert and Hubbs, 1920

Iwamoto, Tomio, Nakayama, Naohide, Shao, Kwang-Tsao & Table, Hsuan-Ching Ho, 2015, Synopsis of the Grenadier Fishes (Gadiformes; Teleostei) of Taiwan, Proceedings of the California Academy of Sciences 62 (3), pp. 31-126 : 42-43

Gadomus magnifilis Gilbert and Hubbs, 1920

Figure 2 .

Gadomus magnifilis Gilbert and Hubbs, 1920:398–401, fig. 4 (holotype USNM 78208; n. Mindanao; Albatross sta. 5515 in about 700 fm [1280 m]; 2 paratypes, Philippines; 508–554 fm [929–1014 m]).— Howes and Crimmen, 1990:197 (descr. from type spec.).— Shao et al., 2008: table 2 (1 spec., SWT, first record for Taiwan) .

MATERIAL EXAMINED.— SWT: ASIZP 65627 (1, 70 HL, 385+ TL); CD 229, 880– 1062 m.

DISTINGUISHING FEATURES.— A species of Gadomus with chin barbel about 29–72% of HL; length elongated P ray 2–3 times HL; prolonged ray in 1D and V greater than 1.5 times HL; 1D II,9–10; P i17–i18; V 8; outer gill rakers bluntly tipped, lathlike, short, about half orbit diameter, (5–6)+(21–23); pyl. caeca 24–29; interorbital width 16–17% HL; orbit diameter 21–24%; suborbital depth 10–15%; upper jaw length 55–60%; chin barbel 29–72% (compiled from Gilbert and Hubbs 1920 and ASIZP 65627).

DISTRIBUTION.— Taiwan ( SWT) to n. Mindanao, Philippines, in 929–1280 m.

REMARKS.— Our identification of the single Taiwan specimen is tentative. Its barbel length is somewhat shorter (29% HL cf. 61–72%) and suborbital somewhat deeper (15% HL cf. 10%) than in the type specimens of G. magnifilis . The Taiwan specimen appears similar to G. introniger in its gill-raker count, barbel length, orbit diameter, and bluntly tipped gill rakers, but differs in having a slightly narrower interorbital (17% cf. 20–23%), slightly deeper suborbital (15% cf. 10–13%), and longer orbit-to-preopercle distance (51% cf. 44–49%). The pyloric caeca could not be counted in our specimen because they had been previously extracted and were unavailable; they may have offered additional clues to the correct identity. Gilbert and Hubbs (1920:396) considered G. denticulatus as closely related to G. magnifilis , but compared to our specimen, G. denticulatus has a much narrower interorbital space (1.5–1.8 into orbit diameter cf. 1.3), slightly larger orbit (23–24% HL cf. 21% in our spec.), and slightly fewer gill rakers (4–6)+(17–22) (23–27 total), cf. 6+23 (29 total).

Figures

FIGURE 2. Gadomus magnifilis Gilbert and Hubbs, 1920. ASIZP 65627, 385+ mm TL, preserved.