Abstract
ABSTRACTThe hyporheic water mite Yachatsia elliptica is newly recorded from southern Japan. This species was originally described as Ussuriaxona elliptica from the Far East. And Ussuriaxona is proven to be synonymous with Yachatsia. The species is distinguished from the North American species Y. mideopsoides in having a horn-like ventral projection on palpal femur and rounder idiosoma. Taking the whole distributional record into consideration, Yachatsia is revealed to show trans-Pacific disjunct distributions between northeastern Asia and western North America. A plausible scenario for the formation of the current distribution of Yachatsia is suggested.
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