附于Brachyunan螃蟹寄主触角上的两种球状外寄生等足类动物（表足目：Dajidae）及一个新属种的描述

Q4 Agricultural and Biological Sciences

Species Diversity Pub Date : 2022-07-21 DOI:10.12782/specdiv.27.227

J. Williams, C. Boyko, Takeya Moritaki

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引用次数: 1

摘要

在本文中，我们描述了在十足寄主的触角周围发现的两个新的大等足类:寄生于Pycnoplax surugensis (Rathbun, 1932)的Akrophryxus acinaces sp. 11(日本中部太平洋沿岸，约200 m深度)和寄生于Parapalicus armatus Castro的A. pallipalicus sp. 11, 2000(中国南海，约410 m深度)。这两个物种的雌性都表现出在Akrophryxus Williams和Boyko, 2021中发现的球形特征。赤狐属三种的雌性可以通过其pleon和oostegite的形态等特征来区分。雄性可以通过头/第1部与第2部的比例和后外侧边缘形状，以及第6部的趾骨和坐骨大小来区分。三种赤蝽不仅在形态特征上存在差异，而且寄生于三种不同的异肢短肢蝇科。在该属的任何物种中，首次描述的隐蝇幼虫期为A。我们还描述了一种新的隐尾虫，Chimaeroniscus spheramator gen. et sp. nov.，这是在宿主Pa上首次发现的来自大蠊寄主的高寄主。armatus)。这种高寄生物被认为是其大体型寄主的卵捕食者，具有独特的属级特征组合，包括:pleon明显比peron窄，触角在基节上有大齿并有刚毛刷，所有的pereomeres上都有3或4个尾齿，pereopod 3 - 7与pereopod 1和2同构且不同，telson具有光滑的双气孔突起，尾足外足为内足动物的一半长度。最后，我们解决了隐蝇科内的一些分类学问题，将两个仅由隐蝇幼虫特征所知的属(Neritoniscus Schultz, 1977和Cryptocisus Schultz, 1977)从隐蝇科incertae sedis移至Dajidae，并将Cryptonus Schultz, 1977与Holophryxus Richardson, 1905同义化。

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Two New Species of Spheroid Ectoparasitic Isopods (Epicaridea: Dajidae) Attached to the Antennules of Brachyuran Crab Hosts, with Description of a New Genus and Species of Hyperparasite (Epicaridea: Cryptoniscoidea)

In this paper, we describe two new species of dajid isopods found enveloping the antennules of decapod hosts: Akrophryxus acinaces sp. nov. parasitizing Pycnoplax surugensis (Rathbun, 1932) (off Pacific coast of central Japan, approximately 200 m depth) and A. pallipalicus sp. nov. parasitizing Parapalicus armatus Castro, 2000 (South China Sea, approximately 410 m depth). Females of both species exhibit the characteristic spheroid shape found in the genus Akrophryxus Williams and Boyko, 2021. Females of the three species in Akrophryxus can be distinguished by several characters, including form of the pleon and oostegite 5. Males can be distinguished by head/pereomere 1 to pereomere 2 ratio and posterolateral margin shape, and pereopod 6 dactylus and ischium size. The three species of Akrophryxus not only differ in morphological characters but parasitize species belonging to three different heterotreme brachyuran families. The first described cryptoniscus larval stage for any species in the genus is described for A . acinaces sp. nov. We also describe a new cryptoniscoid, Chimaeroniscus spheramator gen. et sp. nov., the first hyperparasite described from any dajid host ( A. pallipalicus sp. nov. on the host Pa . armatus ). This hyperparasite is a putative egg predator of its dajid host and exhibits a unique combination of generic level characters including: pleon markedly narrower than pereon, antennule with large teeth on basal segment and with setal brush, 3 or 4 coxal teeth on all pereomeres, pereopods 3–7 isomorphic and dissimilar from pereopods 1 and 2, telson with smooth distomedial projection, and uropodal exopods half-length of endopods. Finally, we address some taxonomic issues within Cryptoniscoidea, moving two genera ( Neritoniscus Schultz, 1977 and Cryptocisus Schultz, 1977) known only by cryptoniscus larval characters from Cryptoniscoidea incertae sedis to Dajidae and synonymize Cryptonus Schultz, 1977 with Holophryxus Richardson, 1905.

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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.