著者

岡西 政典 藤田 喜久

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.46, pp.22-27, 2019-02-28 (Released:2019-03-23)

参考文献数

18

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Ophiuroidea is the largest class of echinoderms and can be found in a great variety of marine habitats such as: in interstices in sponges and hard corals; on muddy ground; infaunally buried in sediments; under rocks; and on the surfaces of various animals such as soft corals. Very few species, however, have been recorded from submarine caves and only one anchialine endemic species, Amphicutis stygobita Pomory, Carpenter & Winter, 2011 is known from Bernier Cave, Bahamas, and three undescribed species were inferred by molecular phylogenetic analysis based on the specimens collected from Mexico. During the course of benthic faunal surveys in three submarine caves of the Ryukyu Islands, southwestern Japan, at 2016 to 2018, 19 ophiuroid species in of 13 genera from 8 families were recorded.

著者

柁原 宏 高久 元 藤田 喜久 角井 敬知

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.46, pp.1-2, 2019-02-28 (Released:2019-03-23)

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Although the 2018 symposium of the Japanese Society of Systematic Zoology, entitled ‘Recent progress and future potential in faunal studies of the submarine caves in the Ryukyu Islands’ was scheduled to be held on the occasion of the 89th annual meeting of the Zoological Society of Japan in Hokkaido, it was unfortunately canceled due to the earthquake ‘2018 Hokkaido Eastern Iburi Earthquake’. However, the five interesting articles were given by the special invited authors: 1) Yoshihisa Fujita ‘The fauna of decapod crustaceans in submarine caves of the Ryukyu Islands, with special reference to environmental factors in the caves’, 2) Yuji Ise ‘Preliminary report of submarine cave sponges in Shimoji Island, Miyako Islands, Okinawa’, 3) Mitchitaka Shimomura ‘Review of recent taxonomic studies of peracarid crustaceans in submarine and anchialine caves of the Ryukyu Islands’, 4) Masanori Okanishi and Yoshihisa Fujita ‘Ophiuroids from submarine caves of the Ryukyu Islands, Japan’, and 5) Akira Iguchi, Masaru Mizuyama, Takefumi Yorisue and Yoshihisa Fujita ‘Current situation and future issues of DNA studies of submarine caves of the Ryukyu Islands’. In this paper, we introduce the purpose and the contents of this special issue.

著者

山崎 柄根

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.1-3, 2012-08-20 (Released:2018-03-30)

著者

谷川 明男

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.20, pp.23-25, 2006-02-20 (Released:2018-03-30)

参考文献数

17

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About 130 years has passed since L. Koch (1878) published the first paper on Japanese spiders. Today there are still many undescribed species in Japan. Based on papers published in the journal of the Arachnological Society of Japan during the last five years, three professional and six amateur researchers are now actively studying the taxonomy of Japanese spiders. Most of their publications are descriptive studies, e.g. description of new species, revision of a genus or a family. Phylogenetic analyses using morphological or molecular data have been published for many countries, but not for Japan. It is becoming increasingly urgent to foster young spider taxonomists. The traditional approach in taxonomy seems to be arbitrary and therefore not attractive for young researchers. Japanese leading taxonomists should adopt modern methods such as phylogenetic analyses in order to attract young successors.

著者

和田 洋 松原 未央子 晴山 健史

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.22, pp.72-79, 2007-02-20 (Released:2018-03-30)

参考文献数

20

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Two types of larval morphology are recognized in extant echinoderms, namely auricularia-type larvae for starfish, sea cucumbers and sea lilies, and pluteus-type larvae for sea urchins and brittle stars. Since sister-grouping of the sea urchins and the sea cucumbers is supported by both fossil evidence and molecular data, the pluteus-type larvae are regarded to have evolved convergently in the sea urchins and the brittle stars. This paper briefly reviews recent progress in our work on comparative molecular developmental studies in the echinoderms. We investigated expressions and function of developmental genes, which are essential for sea urchin larval skeletogenesis, in the starfish and brittle stars. Based on expression data, we infer how the larval skeleton evolved in the sea urchins and brittle stars.

著者

織田 秀実

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.10, pp.3-7, 2001-02-20 (Released:2018-03-30)

参考文献数

22

著者

高島 義和

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.24, pp.17-22, 2008-02-20 (Released:2018-03-30)

参考文献数

5

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Difficulties of identification by using illustrated book and dichotomous key, and problems of tabulating identified taxa are discussed. In many cases, information about diagnoses which discriminate a species from its relatives is not provided well in illustrated books. In dichotomous keys, on the other hand, discriminating characters are summarized tersely for each species but diagnostic characters tend to be subtle and judgment of them are often puzzling for beginner taxonomists. Use of matrix (or tabular) key, which avoid these difficulties, is recom mended. In the case that identification of a specimen does not reach species level, it is placed in a higher taxonomic group, which may contain various entities. Annotations for higher taxa may reduce problems caused by heteroge neity of higher groups.

著者

磯野 直秀

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.7, pp.6-9, 1999-08-20 (Released:2018-03-30)

著者

久保田 信

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.44, pp.69-70, 2018-02-28 (Released:2018-03-20)

著者

吉田 隆太

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

巻号頁・発行日

vol.42, pp.64-65, 2017

著者

小松 美英子

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.27, pp.1-16, 2009

参考文献数

123

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Echinoderms display a great range of life histories, which my students, colleagues, and I have documented though our studies of 42 species, including one echinoid, one holothuroid, four ophiuroids, and 36 asteroids. Here, the general features of echinoderm reproduction are reviewed as they concern the following topics: pairing behavior, brooding, sexual dimorphism, dioecism/hermaphroditism, and others. Larval form in these echinoderms has been modified in various ways through adaptation to planktonic, benthic, intra-gonadal, or intra-gastric larval habitats. The elucidation by Kanatani of the hormonal control mechanism of reproduction in asteroids has provided a means to investigate various aspects of their life history in detail, especially in the genera Asterina, Astropecten, and Luidia. We have found asteroids that pass through a wrinkled blastula stage, divergences among species of Asterina and Astropectinidae, astropectinid sea stars with a newly discovered barrel-shaped larva, and the limits of occurrence of the non-brachiolarian type of development in the Astropectinidae and Luidiidae. The life history of astropectinid species, including both a bipinnaria and a barrel-shaped larva, differs from that of luiidiids, with only a bipinnaria. On this basis, we suggest that the Astropectinidae and Luidiidae probably do not belong to the same ordinal-level taxonomic group. This result agrees with the 18S rDNA-based asteroid phylogeny previously reported by Matsubara and us.