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Three new species of the demersal calanoid copepod Placocalanus (Ridgewayiidae) from Okinawa, southern Japan
Ohtsuka, S.; Fosshagen, A.; Soh, H.Y. (1996). Three new species of the demersal calanoid copepod Placocalanus (Ridgewayiidae) from Okinawa, southern Japan. Sarsia 81: 247-263
In: Sarsia. University of Bergen. Universitetsforlaget: Bergen. ISSN 0036-4827; e-ISSN 1503-1128
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  • Ohtsuka, S.
  • Fosshagen, A.
  • Soh, H.Y.
Abstract
    Three new species of Placocalanus are described from sandy bottoms off Nagannu Island, Okinawa, southern Japan, at a depth of ca 50 m. This is the first record of the genus in the Indo-Pacific region. A number of differences in segmentation and setation in appendages are found between the Pacific and Atlantic species. In particular the Pacific species have a reduced number of setae of the legs compared with their Atlantic congeners. Specialized characters of Placocalanus such as the laterally compressed prosome, expanded proximal plate of the antennule and markedly modified leg 1 are discussed from a functional point of view. Cooccurrence of several species of a genus is common among demersal calanoid copepods, and is briefly discussed.
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