著者

Saba Masaki Iwao Kenji Fujita Toshihiko

出版者

日本動物分類学会

雑誌

Species diversity : an international journal for taxonomy, systematics, speciation, biogeography, and life history research of animals (ISSN:13421670)

巻号頁・発行日

vol.17, no.1, pp.21-28, 2012-05-25

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A new asterinid, Disasterina akajimaensis sp. nov., is described from a specimen collected at Akajima Island, the Ryukyu Islands, Japan. It is clearly distinguishable from its five congeners by the following diagnostic characters: body relatively low and flat, uncalcified interradial areas conspicuous on ventral interradii, papulae numerous in center of disc, abactinal plates mostly lacking spinelets, inferomarginal plates with 2-4 spinelets, actinolateral plates with 1 spine, oral plates with 4-5 oral spines and no suboral spine, adambulacral plates with 1-3 furrows and 1 subambulacral spine. This is the first report of this genus from Japanese waters. Notes on the genus Disasterina and a tabular summary of the characters of the currently known species are also given.

著者

Miyake Hiroshi Iwao Kenji Kakinuma Yoshiko ミヤケ ヒロシ イワオ ケンジ カキヌマ ヨシコ

出版者

鹿児島大学

雑誌

南太平洋研究 (ISSN:09160752)

巻号頁・発行日

vol.17, no.2, pp.273-285, 1997

被引用文献数

3

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We investigated the seasonal occurrence, growth, age, and life history of Aurelia aurita in the Taniyama areaof Kagoshima Bay, also some of the environmental factors such as the specific gravity, pH and the temperature,influence the appearance of Aurelia aurita in the surface layer. The size of an individual depends on environmentalfactors. In contrast the number of branching points of radial water vascular canals increasing with time, independentlyof environmental factors, and therefore could be used as an age index.By using age index, the population of Aurelia aurita sampled may consist a mixture of two cohorts. Theassumption may be that the life span of Aurelia aurita is up to two years.By examining all stages of the life history of Aurelia aurita in Kagoshima Bay and comparing it with that ofother locatives, it is found that the life form of Aurelia varies with their environmental circumstances. We suggestthat how the habitat influence the life history in Aurelia should now be reviewed.