A new freshwater species of Gnorimosphaeroma (Crustacea, Isopoda, Sphaeromatidae) from Chichi-jima Island, Ogasawara Islands, Japan

IF 1.6 2区生物学 Q2 ZOOLOGY Zoosystematics and Evolution Pub Date : 2023-11-21 DOI:10.3897/zse.99.108032

Ko Tomikawa, Junpei Yoshii, Akari Noda, Chi-Woo Lee, Tetsuro Sasaki, Naoya Kimura, Noboru Nunomura

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引用次数: 0

Abstract

This study describes Gnorimosphaeroma rivularesp. nov. from a stream on Chichi-jima Island, Ogasawara Islands, Japan. This is the second freshwater species of Gnorimosphaeroma and the third Sphaeromatidae from oceanic islands. Gnorimosphaeroma rivularesp. nov. is morphologically similar to G. boninense Nunomura, 2006, G. naktongense Kwon & Kim, 1987 and G. saijoense Nunomura, 2013. However, G. rivularesp. nov. differs from these species in various morphological features, such as the shape of pleotelson and pereopod 2, relative length of antennule peduncular articles and pleopod 3 rami, number of setae on maxillula and maxilliped, and setation on pereopod 3. Phylogenetic analyses revealed that G. akanense is sister to G. saijoense, and together they are sister to G. hokurikuense. This three taxa clade is sister to G. rivularesp. nov. with G. iriei basal to them all. Our analysis concludes that G. boninense from Haha-jima Island, Ogasawara Islands is only distantly related to G. rivulare and may represent an independent colonization event.

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标题日本小笠原群岛七岛淡水甲壳类(甲壳纲，等足目，球形虾科)一新种

本研究描述了一种河流黑斑血肿。11月摄于日本小笠原群岛一岛的小溪上。这是褐藻属的第二个淡水种和第三个来自海洋岛屿的褐藻科。Gnorimosphaeroma rivularesp。11 .在形态上与G. boninense numura, 2006, G. naktongense Kwon & Kim, 1987和G. saijoense numura, 2013相似。然而，G. rivularesp。11 .在形态特征上与这些种不同，如多肢肢和准足类2的形状、触角柄花序和准足类3支的相对长度、上唇和上唇上的刚毛数量以及准足类3上的坐位。系统发育分析表明，赤蛇属与齐氏蛇属为姊妹，与北栗蛇属为姊妹。这三个分类群分支是G. rivularesp.的姊妹分支。11月，在它们的基部有鸢尾。结果表明，来自小笠原群岛哈哈哈岛的G. boninense与G. rivulare的亲缘关系较远，可能代表了一个独立的殖民事件。

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来源期刊

Zoosystematics and Evolution ZOOLOGY-

CiteScore

3.50

自引率

5.00%

发文量

审稿时长

16 weeks

期刊介绍： Zoosystematics and Evolution, formerly Mitteilungen aus dem Museum für Naturkunde in Berlin, is an international, open access, peer-reviewed life science journal devoted to whole-organism biology. It publishes original research and review articles in the field of Metazoan taxonomy, biosystematics, evolution, morphology, development and biogeography at all taxonomic levels. The journal''s scope encompasses primary information from collection-related research, taxonomic descriptions and discoveries, revisions, annotated type catalogues, aspects of the history of science, and contributions on new methods and principles of systematics. Articles whose main topic is ecology, functional anatomy, physiology, or ethology are only acceptable when of systematic or evolutionary relevance and perspective.