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Ophiocara macrostoma Kobayashi & Sato, 2023 Dark-fin gudgeon |
| Family: | Butidae (Gudgeon gobies) | |||
| Max. size: | 9.58 cm SL (male/unsexed) | |||
| Environment: | demersal; freshwater; brackish; marine, amphidromous | |||
| Distribution: | Northwest Pacific: Japan (Ryukyu Arch.). | |||
| Diagnosis: | Dorsal spines (total): 7-7; Dorsal soft rays (total): 7-8; Anal spines: 1-1; Anal soft rays: 6-8; Vertebrae: 26-26. This species is distinguished from congeneric species by the following set of characters: longitudinal row scales 33-36; transverse row scales 11-13; predorsal scales 21-25; snout length 9.7-11.1% of SL; upper jaw length 14.4-17.5% of SL; caudal fin length 27.9-40.4% of SL; opercular scales cycloid; body with two interrupted, vertical light brown bands, below dorsal fin and on caudal peduncle. Colouration: second dorsal fin with diffuse white spots; caudal fin dark, no spots; head and trunk of adults with brilliant blue or green spots; caudal fin base in juveniles with three distinct bright markings (Ref. 133165). | |||
| Biology: | ||||
| IUCN Red List Status: | Not Evaluated (N.E.) Ref. (130435) | |||
| Threat to humans: | harmless | |||