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 koikeisp. 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. koikeisp. 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. koikeisp. nov. and C. melanoparvus. A supplementary description of the spermathecae of C. melanoparvus is also provided.

No abstract

The taxonomic status of the two Japanese species of the spider genus Cybaeus L. Koch, 1868, viz., C. communis Yaginuma, 1972 and C. maculosus Yaginuma, 1972, is revisited on the basis of male and female specimens, which were collected from each type locality and the adjacent areas, along with the holotypes of both species. Mitochondrial cytochrome c oxidase subunit I and nuclear internal transcribed spacer 1 sequence data confirmed that C. communis and C. maculosus are conspecific, and C. maculosus is synonymized with C. communis. The obtained molecular phylogenies corroborate the monophyly of C.

No abstract