A team of researchers from the National University of Singapore (NUS) and the University of the Ryukyus has recently identified and described a bizarre new genus and species of xanthid crab found on Okinawa Island, Ryukyu Islands, Japan. Named Mabui calculus, it is unique among the 7,800 species of known crabs in having strongly asymmetrical male and female reproductive structures!
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Source: Phys.org