Two New Species of Microloxoconcha (Crustacea: Ostracoda: Podocopida) from Japan, with a Redescription of the Genus

Abstract

In the original description, the interstitial ostracod genus Microloxoconcha Hartmann, 1954 was diagnosed by the morphology of its carapace and the number of segments in the antennula, antenna, and mandibula; these characters, however, are frequently shared with other taxa. The genus is therefore redescribed with special emphasis on the hinge morphology, antennula form, and large seventh limb. Furthermore, two new species of this genus are described: M. schornikovi sp. nov. from sandy beaches of the Miura Peninsula, central Japan, and M. kikaijimaensis sp. nov. from Kikaijima Island, Amami Islands, southern Japan. New descriptive terminology is proposed for structural details of the male copulatory organ of Microloxoconcha.