タクサ:日本動物分類学会誌
Online ISSN : 2189-7298
Print ISSN : 1342-2367
最新号
選択された号の論文の11件中1~11を表示しています
JSSZ SYMPOSIUM 2019
  • 古屋 秀隆
    2020 年 48 巻 p. 1-2
    発行日: 2020/02/29
    公開日: 2020/03/13
    ジャーナル オープンアクセス

    The 2019 symposium of the Japanese Society of Systematic Zoology, entitled ‘Current taxonomic studies on invertebrate fauna in Kumano Sea’ was held on the occasion of the 90th annual meeting of the Zoological Society of Japan in Osaka City University during 12 to 14 September 2019. The five interesting talks were given by the special invited speakers: Hidetaka Furuya ‘Dicyemid fauna in the Kumanonada-Sea’; Takato Izumi ‘Isactinernus quadrilobatus Carlgren, 1918 (Anenthemonae: Actinernidae) collected from the Kumano Sea-To put an end to the taxonomical confusion by the specimen for a century!’; Masanori Okanishi ‘Ophiuroids from the Kumano Sea’; Naoto Jimi ‘Survey of benthic fauna in the Kumano Sea by T/S Seisui-Maru’: Takeya Moritaki ‘Collaboration between aquarium and researchers on invertebrates from Kumano Sea’.

  • 古屋 秀隆
    2020 年 48 巻 p. 3-12
    発行日: 2020/02/29
    公開日: 2020/03/13
    ジャーナル オープンアクセス

    Dicyemids (phylum Dicyemida) are endosymbionts that typically are found in the renal sac of benthic cephalopod molluscs. The dicyemid bodies consist of only 8 to 40 cells, which are the fewest in number of cells in metazoans, and are organized very simply. Typically, two or three dicyemid species are found in a single specimen of the host, and most of them show high host specificity. Dicyemid species have been examined in the benthic cephalopods collected from the Kumano Sea at a seafloor depth of 150–400 m using bottom trawl nets since 2013. Twenty-five undescribed species of dicyemids, included in five genera, were found in 15 species of cephalopods. There is a considerable diversity of dicyemids in relatively narrow range of localities of the Kumano Sea. Here current taxonomic studies on dicyemid fauna in the Kumano Sea are briefly reported.

  • 泉 貴人, 藤井 琢磨, 柳 研介, 藤田 敏彦
    2020 年 48 巻 p. 13-19
    発行日: 2020/02/29
    公開日: 2020/03/13
    ジャーナル オープンアクセス

    Isactinernus quadrilobatus Carlgren, 1918, the only species of genus Isactinernus, is characterized by an oral disc with four equally-sized lobes. In 2003 Synactinernus flavus Carlgren, 1918, which is characterized by four large and four small lobes alternately arranged, was synonymized into I. quadrilobatus because the difference of lobe shape was thought to be intraspecific variation, and thus the genus Synactinernus was also synonymized into Isactinernus. However, our molecular phylogenetic analysis of Actinernidae including I. quadrilobatus collected from the Kumano Sea revealed that I. quadrilobatus is genetically distinct from S. flavus. Our morphological comparison between the two species supported the result of the molecular analysis. Consequently, the genus Synactinernus was re-established and separated from Isactinernus. Additionally, during this study, we discovered and described an additional species of the genus, Synactinernus churaumi Izumi and Fujii, 2019.

  • 岡西 政典
    2020 年 48 巻 p. 20-26
    発行日: 2020/02/29
    公開日: 2020/03/13
    ジャーナル オープンアクセス

    The Ophiuroidea is numerically the largest class of echinoderms and can be found in a great variety of marine habitats such as: in the interstices of sponges and hard corals; on muddy ground; infaunally buried in sediments; under rocks; and on the surfaces of various animals such as soft corals. Twenty one species have been recorded from the Kumano Sea, off the Kii Peninsula, central Japan but no surveys of this region have been performed since 1980. During the benthic faunal surveys of the Kumano Sea in 2013 by the fishing vessel Syouei-Maru and in 2016 to 2019 by the T/S Seisui-Maru of Mie University, 64 ophiuroid species from 14 families were recorded.

  • 自見 直人, 木村 昭一, 小川 晟人, 木村 妙子
    2020 年 48 巻 p. 27-33
    発行日: 2020/02/29
    公開日: 2020/03/13
    ジャーナル オープンアクセス

    The Kumano Sea has wide-range depths and various environments of the deep seafloor. Inventory of benthic animals is poorly known around the sea because there were few research cruises or investigations in this area. In this situation, training/research vessel (T/RV) Seisui-maru that belongs to Mie University plays a role of center of excellence for investigation of marine science around the Kumano Sea. The vessel has the ability to operate various kinds of research equipment for the benthos survey and conducts many training cruises. Recently, the last author has held annual training/research cruises in the Kumano Sea from 2009 to 2019. Over 16 phyla were recorded, and some of the new species were described based on specimens collected during the cruises. In this paper, we provide an introduction of Seisui-maru, a summary of benthos research at the Kumano Sea, and brief records of polychaetes collected during the cruise in 2017.

  • 森滝 丈也
    2020 年 48 巻 p. 34-40
    発行日: 2020/02/29
    公開日: 2020/03/13
    ジャーナル オープンアクセス

    Toba Aquarium regularly collects marine invertebrates from the Kumano Sea on the Pacific coast of central Japan. These animals are mainly used for exhibition in the aquarium as well as for taxonomic studies. When the taxonomic status of the animals is uncertain, we work with researchers to observe the specimens of those marine invertebrates. From 2006 to 2019, 382 species from 12 phyla have been so far recorded from the bathyal zone of Kumano Sea. Together with 26 researchers, we examined a total of 103 species collected during the surveys and nine out of them were described as new species. Using our rearing techniques, some interesting behaviors of the bathyal marine invertebrates were observed with live specimens in the aquarium.

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