• Journal of Species Research
• /
• v.8 no.1
• /
• pp.116-127
• /
• 2019

Three Loxoconcha Sars, 1866 (L. bizenensis Okubo, 1980, L. japonica Ishizaki, 1968, and L. tosaensis Ishizaki, 1968), one Loxocorniculum Benson and Coleman, 1963 (Lc. mutsuense Ishizaki, 1971), and two Pontocythere Dubowsky, 1939 (P. miurensis(Hanai, 1959), and P. xiphoidea Nakao and Tsukagoshi, 2002) species are briefly redescribed and illustrated. Soft part morphology of L. tosaensis are described and illustrated here for the first time, since this species was known only by the shell morphology. A key to all living Loxoconcha and Loxocorniculum species from East Asia is suggested to facilitate subsequent identification, along with the lists to all East Asian species of the three genera.

• Journal of Species Research
• /
• v.6 no.spc
• /
• pp.38-50
• /
• 2017

This study describes a new species of cytheroid ostracod, Paradoxostoma koreana sp. nov., collected in Korea. In addition, three other cytheroid ostracods, P. setoense Schornikov, 1975, Loxoconcha pulchra Ishizaki, 1968, and Ishizakiella miurensis (Hanai, 1957), are reported with brief descriptions and images. Paradoxostoma setoense and L. pulchra were previously only known from Japan, while I. miurensis was previously reported from Korea. Here, we describe variability in hemipenis morphology observed in the Korean population. The new species is closely related to several East Asian species, but its sister species is P. rhomboideum Okubo, 1977. The primary difference between the new species and P. rhomboideum is morphology of the distal projections of the hemipenis, but minor differences exist in the details of the cheatotaxy of other appendages. This report also provides a list of all East Asian Paradoxostomatidae.