15 0 0 0 OA ジェリーフィッシュライダー : クラゲに乗って浮遊するイセエビ類のフィロゾーマ幼生
- 著者
- 若林 香織 田中 祐志
- 出版者
- 日本動物分類学会
- 雑誌
- タクサ:日本動物分類学会誌 (ISSN:13422367)
- 巻号頁・発行日
- vol.33, pp.5-12, 2012-08-20 (Released:2018-03-30)
- 参考文献数
- 34
Phyllosoma, a zoeal larva with extremely flat body and long appendages of spiny and slipper lobsters, is morphologically different from other decapod zoeas. In natural environments, phyllosomas often associate with planktonic gelatinous organisms such as jellyfish although its ecological implication is still unclear. Here we review the interaction between phyllosomas and gelatinous organisms. Our recent examinations showed that phyllosomas feeding exclusively on jellyfish successfully develop into juvenile, and that phyllosomas could associate with and prey on various species of venomous jellyfish. These results suggest that phyllosomas utilize gelatinous organisms as food sources as well as floating vehicles.
- 著者
- 田中 颯 若林 香織
- 出版者
- 日本動物分類学会
- 雑誌
- タクサ:日本動物分類学会誌 (ISSN:13422367)
- 巻号頁・発行日
- vol.40, pp.22-29, 2016-02-29 (Released:2018-03-30)
Two forms of test are known in a fibulariid sea urchin, Fibulariella acuta (Yoshiwara, 1898). One is a "rice grain-shaped" in which both the anterior and the posterior tips are pointed. Another is an "egg-shaped" in which the anterior tip is pointed but the posterior is broad. This species was originally described as "egg-shaped;" nevertheless, the post described drawing of the syntype by the same author showed its "rice grain-shaped." Although many taxonomic examinations have been made to understand the meaning of difference between the two forms, the meaning has not been clarified until today. We here compared the external morphologies of the test and pedicellariae between the two forms based on 59 specimens from Kumamoto Prefecture, Japan. In addition to the external outline of the tests, morphology of pedicellariae was clearly different between the rice grain-shaped and egg-shaped specimens as follows: the former had three types of pedicellariae (globiferous, bidentate, and biphyllous), whereas the latter had only two types (globiferous and bidentate). These morphological differences suggest that the two forms of F. acuta should be revised as two different species.