Sunday, April 30, 2017

[Ichthyology • 2017] Oxynoemacheilus hazarensis • A New Species from Lake Hazar in Turkey, with Remarks on O. euphraticus (Teleostei: Nemacheilidae)

Oxynoemacheilus hazarensis 
 Freyhof & Özuluğ, 2017 

Oxynoemacheilus hazarensis, new species, from Lake Hazar in the Turkish Tigris drainage, is distinguished from other Oxynoemacheilus in the Tigris drainage by having the combination of a slightly emarginate caudal fin, no suborbital groove in males, an incomplete lateral line, no scales on the back and flank in front of the anus, the maxillary barbel reaching beyond the middle of the eye, an incision in the middle of the upper lip, and the colour pattern on the flank mottled, not interrupted by an unpigmented zone along the lateral line. Oxynoemacheilus euphraticus from the Euphrates and Tigris drainages is a valid species: it is discussed and re-diagnosed against Oargyrogramma.
Keywords: Pisces, Freshwater biodiversity, exploration, Southeastern Anatolia

FIGURE 5. Oxynoemacheilus hazarensis, not preserved, about 65 mm SL; Turkey: North-eastern shore of Lake Hazar. 

Distribution. Oxynoemacheilus hazarensis was found in Lake Hazar, a large tectonic lake in eastern Turkey, and one of the sources of the Tigris. It may be endemic to Lake Hazar.

Etymology. The species is named for its type locality, Lake Hazar. An adjective. 

Remarks. If this is confirmed by intensive field-work in the region, O. hazarensis would be the third fish species endemic to Lake Hazar after Aphanius asquamatus (Cyprinodontidae) and Alburnus heckeli (Cyprinidae).

Jörg Freyhof and Müfit Özuluğ. 2017. Oxynoemacheilus hazarensis, A New Species from Lake Hazar in Turkey, with Remarks on O. euphraticus (Teleostei: Nemacheilidae). Zootaxa. 4247(4); 378–390. DOI:  10.11646/zootaxa.4247.4.2

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