840. THE OSTRACOD GENUS CYTHERE O.F. MULLER, 1785 AND ITS SPECIES

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  • 840. 介形虫 Cythere (O. F. Muller, 1785) 属とその種の記載
  • 介形虫Cythere(O.F.Muller,1985)属とその種の記載〔英文〕
  • カイケイチュウ Cythere O . F . Muller 1985 ゾク

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Abstract

It has been determined that a total of 17 species in the world belong to the genus Cythere s.s. All of these species occur exclusively in the coastal areas of the northwestern and northeastern Pacific and the North Atlantic. The genus is restricted to areas north of the Tropic of Cancer. Cythere species are most diverse around the Japanese Archipelago and neighbouring areas. Cythere species are most diverse around the Japanese Archipelago and neighbouring areas. Cythere first appears in the Miocene, and a total of 12 species, including 9 Recent ones, have been found so far in and around the Japanese Archipelago. On the other hand, only 4 species are found in the northeastern Pacific and only 2 along the northern Atlantic coastal areas. The northeastern Pacific and Atlantic forms are all found in Pliocene or younger deposits. The Cythere species are classified into five species groups on the basis of morphological characteristics. We hypothesize that these groups have been formed in the process of speciation. Members of a group have closer affinities with each other than with a members of any other group. We have re-examined ten species which are already known to science, and we describe 7 new species. The new taxa are C. cronini, C. hanaii, C. kamikoaniensis, C. nopporoensis, C. sanrikuensis, C. valentinei, and an unnamed species.

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