Several specimens of a unique spider were collected in Okinawajima Island, Southwestern Japan. They resemble the spiders of the genus Leucauge and its related genera. Phylogenetic analysis was performed to clarify the taxonomic position of the spider, which showed that the focal spider is a sister of a monophyletic group consisting of Tylorida and Mesida. Therefore it is described as a new genus and species under the name Okileucauge sasakii new species. This species lacks the rows of trichobothria on femur IV, which is the synapomorphy of the genera Tylorida and Mesida.
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