Abstract
The currently known geographical distribution of Chekanovskii’s Minnow, Rhynchocypris czekanowskii (Dybowski, 1869), is limited only by the lower reaches of the arctic river basins in which this species lives. We report R. czekanowskii from the small water bodies of middle part of Yenisei river basin, expanding its distribution to the south of the river basin to 55°51ʹ41ʺ N latitude, more than 100 km south from previously known occurrences of this species.
Highlights
Chekanovskii’s Minnow, Rhynchocypris czekanowskii (Dybowski, 1869), belongs to the genus Rhynchocypris Günther, 1889, which includes 6–11 valid species (Sakai et al 2006, Froese and Pauly 2018, Fricke et al 2019)
The ranges of most species of Rhynchocypris overlap in the northern Far East, which is considered to be the center of speciation of the subfamily Leuciscinae (Ito et al 2002, Sakai et al 2006, Perea et al 2010)
Rhynchocypris czekanowskii is distributed throughout the Amur river basin, where it was first described by Dybowski (Dybowski 1869, Nikol’skii 1956, Karasev 1987, Kottelat et al 2006, Bogutskaya et al 2008)
Summary
Chekanovskii’s Minnow, Rhynchocypris czekanowskii (Dybowski, 1869), belongs to the genus Rhynchocypris Günther, 1889, which includes 6–11 valid species (Sakai et al 2006, Froese and Pauly 2018, Fricke et al 2019). Despite a widespread distribution in Eurasia, this species is poorly known relative to other members of its genus with large ranges: R. percnurus (Pallas, 1814), R. lagowskii (Dybowski, 1869), and R. oxycephalus (Sauvage & Dabry de Thiersant, 1874). In the basins of these arctic rivers, it is thought that this species inhabits only the lower reaches (Reshetnikov 2002, Freyhof and Kottelat 2008; Fig. 1). Our previous studies confirmed the presence of R. czekanowskii in the basin of the Pyasina River and lower reaches of the Yenisei River (Zuev et al 2006). Recently a number of populations of R. czekanowskii have been discovered far to the south of the known distribution area
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