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Systematic Studies of the Orconectes Juvenilis Complex (Decapoda: Cambaridae), with Descriptions of Two New Species

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Abstract The juvenilis complex of the crayfish genus Orconectes has been problematic for over 100 years. Morphological variation across the range of the complex was examined to determine species boundaries and geographic distribution. Multivariate and univariate analyses of characters support the recognition of O. juvenilis and warrant the descriptions of two new species, O. ronaldi and O. cristavarius. The shape of the form I male pleopod, the shape of the rostrum, and the length of the areola are the most useful characters for diagnosing species within the O. juvenilis complex. A key to members of the O. juvenilis complex is provided.

Affiliations: 1: Center for Biodiversity, Illinois Natural History Survey, 607 E. Peabody Drive, Champaign, Illinois 61820, U.S.A. ( ctaylor@mail.inhs.uiuc.edu)

10.1163/20021975-99990023
/content/journals/10.1163/20021975-99990023
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/content/journals/10.1163/20021975-99990023
2017-07-24

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