Ophichthus yamakawai Hibino, McCosker & Tashiro, 2019
Ruler-pattern snake eel

Family:  Ophichthidae (Snake eels), subfamily: Ophichthinae
Max. size:  35.6 cm TL (male/unsexed)
Environment:  demersal; marine; depth range - 100 m
Distribution:  Northwest Pacific: Japan.
Diagnosis:  Vertebrae: 172-172. This species with 4 large dark blotches along lateral line from mid-trunk to posterior tail is distinguished by the following set of characters: head 7.5% TL; tail 58% TL; dorsal-fin origin is behind pectoral-fin tip, 2.7 times pectoral-fin length; teeth are small and conical, uniserial on maxilla, mandible and vomer; total vertebrae 172, predorsal 16, preanal 67 (Ref. 131479).
Biology:  Collecting depth is unknown, but it was possibly collected from deep water ca. 100 m (T. Yamakawa, pers. comm., in Ref. 131479).
IUCN Red List Status: Not Evaluated (N.E.) Ref. (130435)
Threat to humans:  harmless


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