New Species of Grayling Thymallus tugarinae sp. nova
(Thymallidae) from the Amur River Basin

I. B. Knizhin^a, A. L. Antonov^b, S. N. Safronov^c, and S. J. Weiss^d

^aIrkutsk State University, ul. K. Marksa 1, Irkutsk, 664003 Russia

^bInstitute of Water and Ecological Problems, Far Eastern Division, Russian Academy of Sciences, ul. Kim Yu Chena 65,
Khabarovsk, 680000 Russia

^cYuzhno-Sakhalinsk State University, ul. Lenina 290, Yuzhno-Sakhalinsk, 693008 Russia

^dInstitut für Zoologie, Karl-Franzens Universität Graz, Austria

e-mail: knizhin@home.isu.ru

Received May 14, 2005

Abstract—Data on a new species, low Amur grayling Thymallus tugarinae sp. nova, inhabiting tributaries of
the lower and middle current of the Amur River, are presented. This species has been earlier equated with the
Amur grayling T. grubii, described by Dybowski (1869) from the rivers Onon and Ingoda (the Upper Amur
Basin). The new species differs from other representatives of the genus in the body coloration, the pattern on
the upper fin, and certain morphological characters. On most of the Amur Basin, the grayling from the Lower
Amur is sympatric with T. grubii and in its tributary Bureya River, also with the Bureya grayling T. burejensis.
Individuals with intermediate traits are unknown, pointing to reproductive isolation. These data are supported
by the results of molecular-genetic analysis (Froufe et al., 2003, 2005; Knizhin et al., 2004).

DOI: 10.1134/S0032945207020014

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