Melamphaes Xestoachidus (Melamphaes xestoachidus), first described by Kotlyar, 2011 is a small fish in the family Melamphaidae (order Beryciformes). Adults typically reach 8.70 cm in maximum length. It inhabits marine coastal and open-ocean environments. Recorded depth range: 2400 to 3450 metres. It occurs in Deep-water waters. It feeds on a mix of small fish and invertebrates as a mid-level predator. On the IUCN Red List, it is classified as Data Deficient.
The species is characterized by 22–23 rakers on the first gill arch, 30 vertebrae (12 abdominal vertebrae), the haemal arch of the first caudal vertebra is without a spur; D III 14–15; P 16; seven soft rays in the ventral fin; ventral fin starts from the vertical line of the posterior margin of the pectoral fin basement; the anal fin starts from the vertical line of the last ray of the dorsal fin; eight scales are on the operculum .: fusiform / normal.
Behavioural data for Melamphaes Xestoachidus is currently being reviewed.
Marine; bathypelagic; depth range 2400 - 3450 m . Deep-water Pacific Ocean, eastwards of the Kurils Islands.
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