A new hexapodid crab (Decapoda: Brachyura) from the Middle Pleistocene Atsumi Group, Japan, with notes on Hexapus anfractus (Rathbun, 1909) from the Holocene Nanyo Formation, Japan

Abstract

Mariaplax ohiranorikoae, a new species of the crab family Hexapodidae Miers is described from the Middle Pleistocene Atsumi Group of Aichi Prefecture, central Japan. This is the second record for Mariaplax Rahayu and Ng from the Pleistocene deposits of Japan. Hexapus anfractus (Rathbun) recorded from the Holocene Nanyo Formation is re-evaluated and identified with the extant species, Mariaplax chenae Rahayu and Ng.