Abstract
A new species of pond loaches is described from the systems of Chibisanskiye–Vavaiskiye lakes in the south of Sakhalin Island. This species is distinguished from all other Misgurnus species by having a moderately deep body (maximum body depth 7.3–8.6 times in standard length, SL); poorly developed adipose crests; elongated caudal peduncle with its length usually exceeding 19% SL; caudal peduncle depth 1.9–2.4 times in length; dorsal fin begins much closer to the tip of the snout than to the end of the caudal fin; short pelvic fins with their length 1.2–1.7 times in length between the pelvic and anal fins in males and 1.7 times in females; length from pelvic fin base to anal fin base 1.9–2.4 times in the length from anal fin base to caudal fin base; more than 140 transverse rows of scales in the side series; lamina circularis rounded and flat; no distinct black spot at the upper base of the caudal fin. Analysis of several genetic markers (mitochondrial cyt b and fragments of nuclear genes Rag1 and IRBP) proved that the new species is an independent phylogenetic lineage within Misgurnus, the same rank as the M. nikolskyi lineage or the group including M. mohoity and M. anguillicaudatus.
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Notes
In this study we have extended the common name “pond loach”, adopted for M. anguillicaudatus, to all other Asian species of Misgurnus, since they do not have accepted English trade names (FishBase…, 2021).
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ACKNOWLEDGMENTS
The authors are deeply grateful to Marina Shedko, Olga Shedko, Sergei Makeev and Sergei Safronov—for the samples provided, and I.L. Miroshnichenko and G.A. Nemkova—for helping with DNA sequencing. The authors are deeply grateful to anonymous referees for the analysis of the work and useful comments.
The results were obtained using the equipment of Shared Resource Center “Far Eastern Computing Resource” IACP FEB RAS (https://cc.dvo.ru).
Funding
Scientific investigations of E.D. Vasil’eva are supported by the State Project of ZMMU no. 121032300105-0.
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Shedko, S.V., Vasil’eva, E.D. A New Species of the Pond Loaches Misgurnus (Cobitidae) from the South of Sakhalin Island. J. Ichthyol. 62, 356–372 (2022). https://doi.org/10.1134/S0032945222030158
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DOI: https://doi.org/10.1134/S0032945222030158