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Spiders of the genus    Cybaeus    L. Koch, 1868 exhibit two major centers of diversity: Western North America and Japan. Several Japanese    Cybaeus    possess an elongated embolus in the male palp and elongated tubular spermathecae in the female genitalia. Here we describe    Cybaeus   koikei    sp. nov.  from central Honshu, Japan, which has an unelongated embolus and bulbous spermathecae. Phylogenetic analyses using nuclear and mitochondrial gene markers clearly support the monophyly of    C.   koikei    sp. nov.  and    Cybaeus   melanoparvus    Kobayashi, 2006, a species with elongated genitalia. Both species share a similar habitus and a cluster of robust setae on the lateral surface of the male palpal patella. The latter is considered a synapomorphy for    C.   koikei    sp. nov.  and    C.   melanoparvus   . A supplementary description of the spermathecae of    C.   melanoparvus    is also provided.

zoosystematics and evolution

A new species of    Cybaeus    L. Koch, 1868 (  Araneae  ,   Cybaeidae  ) with simple genitalia from central Japan is the sister species of    C.   melanoparvus    Kobayashi, 2006 with elongated genitalia