Abstract

An ascothoracidan crustacean of the genus DendrogasterKnipowitsch, 1890 (Dendrogasteridae), known for more than 80 years to infect the sea star Certonardoa semiregularis (Müller & Troschel, 1842) and previously identified as Dendrogaster ludwigiLe Roi, 1905, is described as a new species on the basis of recently collected specimens from Mie and Yamaguchi Prefectures, Japan. Dendrogaster adhaerensn. sp. was found within the coelomic cavity of the arms of its host sea star. Partial sequences of the cytochrome c oxidase subunit I (COI) gene show that the specimens from both localities are conspecific. This new species was also confirmed to be morphologically distinct from Dendrogaster sp. cf. ludwigi infecting Echinaster luzonicus (Gray, 1842), which has also been confused with D. ludwigi. The new species differs from all of its congeners in the anastomosis of the posterior primary branches and its adhesion to the inner body wall of the host.

中文翻译：

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来自日本的海星Certonardoa semiregularis（Müller＆Troschel，1842）（Echinodermata：Asteroidea）寄生于海星Certonardoa semiregularis的一种新物种Dendrogaster Knipowitsch，（1890）

摘要

1890年，Dendrogaster Knipowitsch属的一种甲壳酸甲壳类动物（Dendrogasteridae），以感染海星Certonardoa semiregularis（Müller＆Troschel，1842年）而闻名，已有80多年的历史，以前被称为Dendrogaster ludwigi Le Roi，1905年。以日本三重县和山口县最近收集的标本为基础。Dendrogaster adhaerens n。sp。被发现在其寄主海星臂腔的腔内。细胞色素C氧化酶亚基I（COI）基因的部分序列表明，来自两个地方的标本都是同种的。该新物种还被证实在形态上与Dendrogaster sp。不同。cf.路德维希氏菌感染了紫锥菊（Echinaster luzonicus，灰色，1842年），后者也与路德维希氏菌（D. ludwigi）相混淆。该新物种在后初级分支的吻合及其对宿主体内壁的粘附方面不同于其所有同类物。