Opistognathus ensiferus Smith-Vaniz, 2016
Mannar jawfish

Family:  Opistognathidae (Jawfishes)
Max. size:  3.88 cm SL (male/unsexed)
Environment:  reef-associated; marine; depth range 0 - 1 m
Distribution:  Eastern Indian Ocean: India.
Diagnosis:  Dorsal spines (total): 11-11; Dorsal soft rays (total): 14-14; Anal spines: 3-3; Anal soft rays: 14-14; Vertebrae: 28-28. This species is distinguished by the following characters: with an elongate supramaxilla and maxilla with flexible lamina posteriorly, widest before end and sword-shaped in adult males, extending to rear margin of opercle (2.2 eye diameters behind posterior margin of orbit); D XI,14; A III,14; vertebrae 10 + 18; scale rows in horizontal series about 48-52; the lateral-line terminus ending below segmented rays 6-7. Colouration: spinous dorsal fin with large ocellus between spines 3-6; the inner lining of upper jaw and adjacent membranes with a single dark stripe; unpigmented area above and below esophageal opening (Ref. 128946).
Biology:  It is found in reefs, on living and dead coral, sand and rubble (Ref. 128946).
IUCN Red List Status: Data deficient (DD); Date assessed: 18 July 2017 Ref. (130435)
Threat to humans:  harmless


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