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Systematics, phylogeny and zoogeography of genus Yoraperla (Plecoptera: Peltoperlidae)

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Yoraperla Ricker, 1952 is revised and 4 nearctic and 3 oriental species are recognized. Three new species, X siletz, Y. han and Y. uchidai, are described and Y. nigrisoma (Banks, 1948) is removed from the synonymy of Y. brevis (Banks, 1907). Phylogenetic and zoogeographic analyses support the hypothesis of two disjunct clades isolated by an increase in sea level in the Bering Straits. The east Asian clade is consistently resolved with the two Korean species Y. han and Y. uchidai forming a sister group relationship apart from the Japanese species Y. uenoi, while resolution of the western North American clade is less secure. Yoraperla probably arose in the Sierra Nevada of North America and migrated to east Asia along an inland route including the Rocky Mts. Future collection and conservation suggestions are given.

Affiliations: 1: Dept of Biology, Mississippi College, Clinton, Mississippi, 39058, USA; 2: C. R. Nelson, Dept of Zoology, University of Texas, Austin, Texas, 78712, USA


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