Natural history of the brackish-water ostracode genus Ishizakiella from East Asia : Evidence for heterochrony
Natural history of the brackish-water ostracode genus Ishizakiella from East Asia : Evidence for heterochrony
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东亚咸水介形虫属 Ishizakiella 的自然历史：异时性的证据
DOI：
10.1163/193724094x00290
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发表时间：
1994
影响因子：
1.1
通讯作者：
Akira Tsukagoshi
中科院分区：
文献类型：
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作者：
Akira Tsukagoshi
Ishizakiella属（足形目：介形类）是由McKenzie和Sudijono（1981）提出的爪哇上新世-更新世化石种。本文报道了日本列岛河口及近岸上带的石崎虫属3种。其中一个是新物种，我。ryukyuensis，产于冲绳和西表。本文报道了该属植物的几丁质部分及其生态学。miurensis为首次描述。我的甲壳。来自北方地区的supralittoralis，即，千岛群岛和北海道的石崎氏菌属，与其它种相比，其边缘区狭窄，附着力差，铰合简单。I的这些特殊的特征。在另外两个物种的幼鱼中发现了supralittoralis。从目前的地理分布和化石记录来看，东亚的石崎虫属物种肯定是在早更新世从南太平洋地区迁移过来的。Ishizakiella supralittoralis是最新的衍生分类群，因为本种分布在最北部地区。幼象特征的supralittoralis可归因于幼态进化。
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.