Phylogenetic position of Setopus (Gastrotricha, Paucitubulatina) among planktonic Gastrotricha, with the description of a new species

IF 1.3 3区生物学 Q2 ZOOLOGY

Zoologischer Anzeiger Pub Date : 2026-03-01 Epub Date: 2026-01-24 DOI:10.1016/j.jcz.2026.01.012

Francesco Saponi , Agata Cesaretti , Anush Kosakyan , Valentina Serra , M. Antonio Todaro

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引用次数: 0

Abstract

The understanding of phylogenetic relationships within the phylum Gastrotricha is currently evolving, revealing significant discrepancies between the evolutionary interpretations based on morphology and molecular data. This inconsistency also applies to the families Dasydytidae and Neogosseidae, which include the remarkable planktonic gastrotrich species of the order Chaetonotida. The inter- and intra-relationships within these families remain unclear, mainly due to incomplete taxonomic sampling. In this study, we describe a new species of Setopus and provide its 18S, 28S, and COI genetic sequences. We also provide the sequences of Setopus tongiorgii (Balsamo, 1983), offering the first available molecular data for the genus. The new sequences were used in a phylogenetic analysis that encompassed 53 terminals, covering a broad taxonomic range. The results indicate that the two Setopus species are closely related to Ornamentula Kisielewski, 1991 and highlight a possible non-monophyletic nature of the family Dasydytidae, with members of the family Neogosseidae falling within it.

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浮游天头虫的系统发育地位及一新种的描述

对腹虫门系统发育关系的认识正在不断发展，揭示了基于形态学和分子数据的进化解释之间的重大差异。这种不一致也适用于毛藻科和新毛藻科，其中包括毛藻目中引人注目的富含胃的浮游物种。这些科之间和内部的关系仍然不清楚，主要是由于不完整的分类抽样。本研究描述了一新种Setopus，并提供了其18S、28S和COI基因序列。我们还提供了Setopus tongiorgii （Balsamo, 1983）的序列，提供了该属的第一个可用的分子数据。新序列被用于包含53个末端的系统发育分析，覆盖了广泛的分类范围。结果表明，这两个Setopus种与装饰物（Ornamentula Kisielewski, 1991）亲缘关系密切，并突出了Dasydytidae科的非单系性质，其中包括Neogosseidae科的成员。

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

Zoologischer Anzeiger 生物-动物学

CiteScore

2.80

自引率

7.10%

发文量

审稿时长

>12 weeks

期刊介绍： Zoologischer Anzeiger - A Journal of Comparative Zoology is devoted to comparative zoology with a special emphasis on morphology, systematics, biogeography, and evolutionary biology targeting all metazoans, both modern and extinct. We also consider taxonomic submissions addressing a broader systematic and/or evolutionary context. The overall aim of the journal is to contribute to our understanding of the organismic world from an evolutionary perspective. The journal Zoologischer Anzeiger invites suggestions for special issues. Interested parties may contact one of the editors.