Marine microturbellarians from Japan, with descriptions of two new species of Reinhardorhynchus (Platyhelminthes, Rhabdocoela, Koinocystididae)

IF 1.6 2区生物学 Q2 ZOOLOGY

Zoosystematics and Evolution Pub Date : 2024-07-03 DOI:10.3897/zse.100.120244

Aoi Tsuyuki, J. Reyes, Yukihisa Oya, K. Wakeman, B. Leander, N. V. Van Steenkiste

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引用次数: 0

Abstract

Marine microturbellarians are an assemblage of meiofaunal flatworms abundant in sediments and on seaweeds around the world. The diversity and distribution of these animals in Japan are poorly understood. Here, we provide an overview of all recorded species in Japan and characterize two new species of the rhabdocoel genus Reinhardorhynchus based on morphological features and a molecular phylogeny inferred from 18S and 28S rDNA sequences. Reinhardorhynchus ryukyuensissp. nov. can be distinguished from other species in the genus by the lack of an armed cirrus and by the presence of two larger opposing hooks and five smaller interconnected hooks in its male copulatory organ. Reinhardorhynchus sagamianussp. nov. differs from its congeners because its male copulatory organ combines a bipartite cirrus armed with a belt of overlapping scale-like spines, an unarmed accessory cirrus, and two large distal accessory hooks. Our molecular phylogenetic analyses show that R. ryukyuensissp. nov. and R. sagamianussp. nov. form a clade with all the other species of Reinhardorhynchus for which DNA sequence data are available. Within this clade, R. sagamianussp. nov. is in a clade that also includes R. riegeri and R. anamariae. The discovery of these new species highlights the importance of uncovering and documenting the hidden biodiversity along Japan’s coastal margin.

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来自日本的海洋微涡虫，其中描述了 Reinhardorhynchus 的两个新种（扁形动物，Rhabdocoela，Koinocystididae）。

海洋微涡虫是一种小型扁形动物，广泛分布于世界各地的沉积物和海藻上。人们对这些动物在日本的多样性和分布情况知之甚少。在此，我们概述了在日本记录到的所有物种，并根据形态特征以及从 18S 和 28S rDNA 序列推断出的分子系统进化推断出了两个新的斜管圆线虫属（Reinhardorhynchus）物种。Reinhardorhynchus ryukyuensp.nov.与该属其他物种的区别在于其雄性交配器官没有武装的卷须，并且有两个较大的对立钩和五个较小的相互连接的钩。Reinhardorhynchus sagamianussp.nov.不同于其同属种，因为其雄性交配器官结合了一个带重叠鳞片状棘带的双瓣卷须、一个不带武器的附属卷须和两个大的远端附属钩。我们的分子系统学分析表明，R. ryukyuensp.在这个支系中，R. sagamianussp.这些新物种的发现凸显了发掘和记录日本沿海边缘隐藏的生物多样性的重要性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.