Kamoharaia Kuronuma, 1940

Amaoka, Kunio & Ho, Hsuan-Ching, 2019, The lefteye flounder family Bothidae (Order Pleuronectiformes) of Taiwan, Zootaxa 4702 (1), pp. 155-215 : 191-193

Genus Kamoharaia Kuronuma, 1940

Kamoharaia Kuronuma, 1940:35 . Type species: Chascanopsetta megastoma Kamohara, 1936 .

Diagnostic features. Body long elliptical, strongly compressed. Tip of isthmus far behind posterior margin of lower eye, located above posterior end of lower jaw. Dorsal profile of head constant with sex and growth. Caudal peduncle narrow. Both eyes separated by ridge or a very narrow concave space; interorbital width same in both sexes. No rostral, orbital and mandibular spines in both sexes.

Mouth extremely large; maxilla extending far beyond posterior margin of lower eye, tip of upper jaw projecting beyond tip of snout; upper-jaw length about equal to HL. Anterior half of upper jaw uniserial, with some enlarged teeth anteriorly, followed by tooth band on posterior half; teeth on lower jaw uniserial with 3 pairs of canines at anterior tip. Gill rakers small, without spines.

Scales small, cycloid on both sides. Lateral line on ocular side curved above pectoral fin; lateral line absent on blind side. First ray of dorsal fin slightly elongate. Pectoral fin on ocular side not elongate in both sexes. Pelvic fin on ocular side starting at tip of isthmus, with rather short base; first ray on blind side opposite to third fin ray on ocular side. Caudal skeleton consisting of four plates including parhypural and three hypurals, without deep clefts. Suborbital bones 3 on blind side. Tip of vomer projecting into mouth.

Remarks. Kamoharaia is closely related to Chascanopsetta with which it shares an extremely large mouth, but it can be distinguished from the latter by the tip of the upper jaw extending beyond the tip of the snout, the presence of large canine teeth at the tip of the lower jaw, and in the tip of the vomer projecting into the mouth.