Finding of the Second Canestrini’s Organ in Loach Species (Cobitidae) Characterized by a Single Lamina Circularis on the First Branched Ray of the Pectoral Fin in the Mature Males. An Atavism or an Innovation?

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We found an additional Canestrini’s organ in some males of Cobitis lutheri, C. derzhavini, and Misgurnus chipisaniensis, which normally have one lamina circularis on the first branched ray of the pectoral fin. We consider this as a manifestation of atavism. In the case of C. lutheri and C. derzhavini, this phenomenon mimics the state observed in the Bibarba lineage, and in the case of the pond loach, in the Bicanestrinia lineage. It is suggested that the primitive ancestral state for the entire Northern Clade of loaches should be considered to be the presence of two or even three laminae circularis in the pectoral fin of sexually mature males. In most lineages this state is lost, however, there probably was a phylogenetic reversion in the ancestor of the Bicanestrinia group through fixation of the atavistic state as a norm.

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作者简介

E. Vasil’eva

Zoological Museum of Lomonosov Moscow State University

编辑信件的主要联系方式.
Email: vas_katerina@mail.ru
俄罗斯联邦, Moscow

S. Shedko

Federal Scientific Center of the East Asia Terrestrial Biodiversity, Far Eastern Branch of the Russian Academy of Sciences

Email: vas_katerina@mail.ru
俄罗斯联邦, Vladivostok

参考

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2. Fig. 1. Fragment of the left pectoral fin of a male Cobitis lutheri SL 58.0 mm, ZMMU R-24578 with two Canestrini organs on the first and second branched rays.

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3. Fig. 2. The left pectoral fin of a male Misgurnus chipisaniensis SL 90.5 mm, FSCEATB MBS-054/4 from the collection of the Federal Research Center for Biodiversity of the Far Eastern Branch of the Russian Academy of Sciences with two Canestrini organs on the non-branched and first branched rays.

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