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NATURAL HISTORY OF THE BRACKISH-WATER OSTRACODE GENUS ISHIZAKIELLA FROM EAST ASIA: EVIDENCE FOR HETEROCHRONY

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ABSTRACT The genus Ishizakiella (Podocopida: Ostracoda) was proposed by McKenzie and Sudijono (1981) for a fossil species from the Plio-Pleistocene of Java. Three extant species of Ishizakiella are reported herein from the river mouths and the upper eulittoral zone in the Japanese Islands. One of them is a new species, I. ryukyuensis, from Okinawa and Iriomote. The chitinous parts and ecology of I. miurensis are described for the first time. The carapace of I. supralittoralis from the northern area, i.e., the Kuril Islands and Hokkaido, has poor ornamentation, simple hingement, and a narrow marginal zone in comparison with other species of Ishizakiella. These particular characters of I. supralittoralis are found in the juveniles of the two other species. In view of their present geographical distributions and fossil records, the species of Ishizakiella in East Asia certainly migrated from the South Pacific region in the Early Pleistocene. Ishizakiella supralittoralis is the latest derivative taxon, since this species is distributed in the northernmost area. The juvenile-like characters of supralittoralis are attributable to paedomorphic evolution.

10.1163/193724094X00290
/content/journals/10.1163/193724094x00290
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/content/journals/10.1163/193724094x00290
2017-09-23

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