- 著者
- Hiroshi Namikawa Mariko Kawamura
- 出版者
- National Museum of Nature and Sciece
- 雑誌
- 国立科学博物館研究報告A類(動物学) (ISSN:18819052)
- 巻号頁・発行日
- vol.47, no.4, pp.157-161, 2021-11-22 (Released:2021-11-22)
- 参考文献数
- 4
The polyps of Koellikerina bouilloni Kawamura and Kubota, 2005 were discovered growing on the shell of the gastropod Nassarius festivus (Powys, 1835) collected from Isozaki, Hitachinaka, Ibaraki, Japan. This hydrozoan species was so far known only from the medusae collected in Tanabe Bay, Wakayama, Japan (type locality) and Papua New Guinea. The discovery of the polyp and the rearing of the medusae permitted us to complement the description of this species.
- 著者
- Teruaki Nishikawa Hiroshi Namikawa
- 出版者
- The Japanese Society of Systematic Zoology
- 雑誌
- Species Diversity (ISSN:13421670)
- 巻号頁・発行日
- vol.26, no.1, pp.1-5, 2021-01-01 (Released:2021-01-01)
- 参考文献数
- 13
Overlooked since its establishment, Ascidia sydneiensis protecta Van Name, 1945, originally described as having mantle musculature comprising short parallel fibers restricted to the dorsal margin, compared with musculature along the entire margin (except for a central muscle-free area) found in the so-called “A. sydneiensis group”, is treated as a full species, Ascidia protecta. A detailed examination of the type and non-type specimens of the latter, all collected from the Gulf of California, confirmed the mantle musculature arrangement in the species, as well as revealing several new features (particularly in the alimentary tract), although not supporting a protective function of the anterior tunic to retracted siphons, as suggested in the original description. A comparison of A. protecta was made with congeneric species with similar musculature.
- 著者
- Hiroshi Namikawa
- 出版者
- National Museum of Nature and Sciece
- 雑誌
- 国立科学博物館研究報告A類(動物学) (ISSN:18819052)
- 巻号頁・発行日
- vol.48, no.1, pp.1-4, 2022-02-22 (Released:2022-02-22)
- 参考文献数
- 9
In addition to polyps of the anthoathecate hydroid Koellikerina bouilloni previously reported exclusively on old, eroded shells of live gastropods (Nassarius festivus) in Ibaraki Prefecture, Japan, the polyps of three additional epizoic anthoathecate hydroid species (Dicoryne conybearei, Stylactaria misakiensis and Leuckartiara sp.) were found on similar condition N. festivus shells in different localities in Japan. Because polyps of these hydroid species were not found on fresh shells, it is suggested that N. festivus could avoid colonization by the hydroids whilst occupying fresh shells, but not older eroded ones, the latter therefore providing a suitable substrate for the hydroid polyps.