Abstract
A left valve of Promanawa konishii (Nohara, 1976) was found in the modern surface sediment of the East China Sea, off the western Iheya-Izena Islands, SW Japan (Fig. 1). The specimen was collected from St 447 (26.98°N, 127.72°E, 512 m water depth) during the GH09 cruise by the Geological Survey of Japan, Agency of Industrial Science and Technology (AIST). Promanawa konishii has a laterally compressed semi-elliptical carapace with a wide frill around the entire ventral margin and a long straight hinge, uniquely characteristic of the superfamily Puncioidea which includes the extant genera Manawa, Promanawa and Puncia (Hornibrook, 1949; McKenzie & Neil, 1983), considered by some to represent a surviving lineage of the order Palaeocopida, all others of which have been extinct since the end of the Palaeozoic (Hornibrook, 1949; Swanson, 1991). Living specimens of Manawa were described from a water depth of 17 m off Goat Island, New Zealand, by Swanson (1989, 1991). According to this study, the nauplius larvae of Manawa have a dome-shaped single carapace that is later divided into two valves jointed by hingement during the growth stages; however, ostracods usually have two such valves …
Highlights
Occurrence of a rare puncioid ostracod, Promanawa konishii (Nohara, 1976), in Recent sediments of the East China Sea
The specimen was collected from St 447 (26.98°N, 127.72°E, 512 m water depth) during the GH09 cruise by the Geological Survey of Japan, Agency of Industrial Science and Technology (AIST)
Promanawa konishii has a laterally compressed semi-elliptical carapace with a wide frill around the entire ventral margin and a long straight hinge, uniquely characteristic of the superfamily Puncioidea which includes the extant genera Manawa, Promanawa and Puncia (Hornibrook, 1949; McKenzie & Neil, 1983), considered by some to represent a surviving lineage of the order Palaeocopida, all others of which have been extinct since the end of the Palaeozoic (Hornibrook, 1949; Swanson, 1991)
Summary
Occurrence of a rare puncioid ostracod, Promanawa konishii (Nohara, 1976), in Recent sediments of the East China Sea. A left valve of Promanawa konishii (Nohara, 1976) was found in the modern surface sediment of the East China Sea, off the western Iheya-Izena Islands, SW Japan (Fig. 1). The specimen was collected from St 447 (26.98°N, 127.72°E, 512 m water depth) during the GH09 cruise by the Geological Survey of Japan, Agency of Industrial Science and Technology (AIST). Living specimens of Manawa were described from a water depth of 17 m off Goat Island, New Zealand, by Swanson (1989, 1991).
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