An Additional Specimen of Carcinoplax longimanus from the Iimuro Formation, Kazusa Group (Komae City, Tokyo)

Abstract

An additional specimen of Carcinoplax longimanus was newly discovered from the Iimuro Formation, Kazusa Group (Lower Pleistocene, Komae, Tokyo), and systematically described in this paper. The specimen consists of a well-preserved carapace and pereiopods. Orbital region, pterygostomian region, maxillipeds, segments of thoracic sternum and abdomen are preserved in the carapace. Pereiopods are composed of coxa (or basis), ischium, and propodus. The occurrence of Carcinoplax longimanus from the Iimuro Formation further supports the interpretation of shallow marine sedimentary environments.