Pterophycis, Ho, 2019

Ho, Hsuan-Ching, 2019, A new genus and species of the cod fish family Moridae (Order Gadiiformes) from southwestern Taiwan, Zootaxa 4702 (1), pp. 32-40 : 32-40

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gen. nov.

Pterophycis   gen. nov.

Type species. Pterophycis spatium Ho   , sp. nov. (by monotypy), as described below.

Diagnosis. A genus of Moridae   with a ventral light organ and differs from all other genera by having genital papilla separated from anus by several small scales, a large pelvic fin with all rays elongated ( Fig. 1A View FIGURE 1 ), and the following combination of characters: snout broad and rounded, not shelf-like; palatines and vomer toothless; swimbladder with elongate projections that attached to openings at rear of the skull ( Fig. 2 View FIGURE 2 ); pelvic fin with 7 rays; first dorsal fin short-based, with 8 rays; second dorsal and anal fins long-based, their margins not indented.

Etymology. From Latin pter means fin and phycis, a cod, in referring to the diagnostic large pelvic fin of the genus.

Relationship. The presence of the light organ and two dorsal fins suggest that Pterophycis   gen. nov. is closely related to Physiculus   , Gadella   and Salilota   belong to “ Physiculus   ” subgroup (sensu Paulin, 1989a), which also includes Tripterophycis   that has a light organ and three dorsal fins. It apparently shares many characters with the most specious genus Physiculus   by the absence of vomerine teeth and similar fin elements and position. However, two diagnostic characters that distinguish these two genera are the large pelvic fins with all rays elongate and the position of genital papilla ( Figs. 1A View FIGURE 1 , vs. 1B, C).

In addition to these two diagnostic characters mentioned above, it can be further distinguished from the monotypic genus Salilota   , restricted in southern America, by lacking tooth patch on vomer (vs. small tooth patch on vomer in Salilota   ) and 8 first dorsal-fin rays (vs. 9–12); and from the worldwide distributed genus Gadella   , with 12 species currently, by having chin barbel (vs. absent in Gadella   ) and origin of anal fin slightly behind a vertical of that of second dorsal fin (vs. origin of anal fin well behind that of second dorsal fin). Members of Tripterophycis   , with 2 species restricted in the Southern Hemisphere, have their light organs situated at around the anus and three well-separated dorsal fins which can be easily distinguished from those of other genera.