Monday, July 3, 2017

[Ichthyology • 2017] Rhynchocypris deogyuensis • A New Species of Fat-minnow (Cypriniformes: Cyprinidae) from Korea

 Rhynchocypris deogyuensis
Lee & Sim, 2017 

A new species of deogyu fat-minnow, Rhynchocypris deogyuensis, is described from the Geum River in Korea. This species is distinguished from Rhynchocypris kumgangensis by the following characteristics: shorter interorbital width; shorter eye diameter; longer caudal peduncle depth; number of scales above lateral line; and black transverse bar on the first unbranched ray in dorsal fin. The lower band of yellowish longitudinal two bands on lateral body is interrupted and unsharpened. Numerous silverly white spots are on blackish dorso-lateral body. Analyses of 1,141 bp length of mitochondrial Cyt b gene proved that, R. deogyuensis is clearly distinguished from R. kumgangensis in that the former showed a high level (94 bootstrap) of reliability.

Key words: New species, Rhynchocypris deogyuensis, Fat-minnow, Cyprinidae, Geum River

Figure 1. Rhynchocypris deogyuensis sp. nov. Holotype from the Geum River, Muju, Korea. NPRI 148, male, 68.9 mm SL. Scale bar=10 mm.

Figure 2. Nuptial coloration, A; Rhynchocypris deogyuensis, 68.9 mm, SL, male, collected April 25, 2013, from the Muju. B; R. kumgangensis, 68.2 mm, SL, male, collected April 16, 2013, from the Pyeongchang. Scale bar=10 mm. 

Etymology. The name deogyuensis, distributed in Deogyusan National Park, refers to the geographical occurrence of the species in Korea.

Seung-Rok Lee and Jae-Hwan Sim. 2017. A New Species of Deogyu Fat-minnow, Rhynchocypris deogyuensis (Cypriniformes: Cyprinidae) from Korea.  Journal of National Park Research. 8(1); 1-7.

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