First record of the varunid crab Parapyxidognathus deianira from the coast of the Sea of Japan.

Parapyxidognathus deianira (family Vaninidae) is a rare brackish-water crab, and there is increasing concern about its possible extinction in several region across Japan. We have sampled this species from 20 river estuaries in Kyushu, Japan, from 2014 to 2017. The occurrence of this species in the Sea of Japan coast is being reported for the first time, following the sampling of this species from the Daikon River estuary in Fukuoka Prefecture. Crab and fish fauna at the collection site in the Daikon River suggest that the habitat conditions ofP. deianira at the site are similar to that described in the previous reports of this species. [ABSTRACT FROM AUTHOR]