日本沿海一种小头Gnathiid等足目（甲壳纲），头Gnathia capitalulum sp.nov.的描述

Q4 Agricultural and Biological Sciences

Species Diversity Pub Date : 2021-09-10 DOI:10.12782/specdiv.26.207

Y. Ota, Hisanori Kohtsuka, Katsuhiko Tanaka

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引用次数: 0

摘要

本文描述了小头Gnathia capitellum sp. 11 .(甲壳纲:等足目:Gnathiidae)的成虫、雄虫和幼虫。样本为实验室饲养的寄生于伊豆半岛沿岸海湾延绳钓收集的寄主鱼的幼虫和日本中部三浦半岛浅水(深度:11-12 m)疏浚样本中的成年雄鱼。小头金蝇(G. capitellum sp. nov.)的成年雄蝇头小，卵圆形，尾足内缘无羽状刚毛，很容易与世界其他品种的Gnathia Leach, 1814区分开来。大多数其他Gnathia种类有一个大的矩形头部和羽状刚毛出现在门足的第1条上。成年雄虫的外形类似于Afrignathia Hadfield和Smit, 2008，而不是Gnathia，但Afrignathia有上颌骨1，这在世界上所有已知的雄性gnathiids中都没有，包括G. capitellum sp. nov.。这种幼虫与Gnathia属的幼虫非常相似，但可以通过在准足目2-4中显着的卵形基部与其他Gnathia种区分开来。

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Description of a Small-headed Gnathiid Isopod (Crustacea), Gnathia capitellum sp. nov., from Coastal Japan

Adult male and larva of Gnathia capitellum sp. nov. (Crustacea: Isopoda: Gnathiidae) are described. The specimens were laboratory-reared larvae that infested host fishes collected by longline fishing in a coastal bay of Izu Peninsula and adult males found in dredge samples from shallow water (depth: 11–12 m) of Miura Peninsula, central Japan. Adult males of G. capitellum sp. nov. were easily distinguished from the other species of Gnathia Leach, 1814 from around the world by the small oval head and the inner margin of pylopod without plumose setae. Most other Gnathia species have a large rectangular head and plumose setae present on the article 1 of pylopod. Appearance of the adult male resembles the genus Afrignathia Hadfield and Smit, 2008 rather than Gnathia but Afrignathia has maxilla 1 which is absent in all known male gnathiids in the world including G. capitellum sp. nov. Fish parasitic larva of G. capitellum sp. nov. is also described herein. This larva closely resembles larvae of the genus Gnathia , but can be distinguished from the other Gnathia species by the remarkably oval-shaped basis in pereopods 2–4.

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来源期刊

Species Diversity Agricultural and Biological Sciences-Animal Science and Zoology

CiteScore

1.20

自引率

0.00%

发文量

期刊介绍： Species Diversity is a peer-reviewed, open-access international journal on all aspects of animal species diversity. Species Diversity is published by the Japanese Society of Systematic Zoology. It is the English-language successor of the Proceedings of the Japanese Society of Systematic Zoology and complements the latter’s Japanese-language continuation, Taxa. e purpose of Species Diversity is to facilitate the international ex change of information about animal species diversity by publishing papers dealing with all aspects of taxonomy, systematics, speciation, biogeography, and life his tory research.