First record of Pugettia quadridens (De Haan, 1837) from Hakodate Bay, Hokkaido

Abstract

The kelp crab Pugettia quadridens was recorded from Hakodate Bay, Hokkaido, Japan, representing the first record of Hokkaido and the northern extension of its range after the redescription of P. quadridens by Ohtsuchi & Kawamura (2019). Considering the collected specimen was a mature male and P. ferox, a closely related species to P. quadridens, is the common species in the sampling site, occurrence of reproductive behavior between the two species was examined by observing the mating behavior in an aquarium. The male of P. quadridens did not attempt to mate with either of three females of P. ferox, implying a behavioral reproductive isolation between the two species.