Integrative descriptions of two new Thoracostomopsidae species (Nematoda, Enoplida) with the brief discussion on nematode spicules origin

IF 1.5 3区生物学 Q2 ZOOLOGY

Zoologischer Anzeiger Pub Date : 2025-08-29 DOI:10.1016/j.jcz.2025.08.012

Julia K. Zograf, Kseniya V. Efimova, Vladimir V. Mordukhovich

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引用次数: 0

Abstract

Summary - Nematodes from the family Thoracostomopsidae are ubiquitous in the World Ocean. Two species were found in subtidal bottom sedments off the eastern coast of the Kamchatka Peninsula. A taxonomic revision of the genus Trileptium has been provided. The new genus Neotrileptium gen. nov. was established and two new species Neotrileptium gracilis gen. et sp. nov. and Neotrileptium unicum gen. et sp. nov. are described. Neotrileptium gen.nov. shows all the main characters of Thoracostomopsidae, but differs from all known thoracostomopsids in the shape and position of the mandibular complexes (situated well forward in a spacious buccal cavity). The new species differ from others in this genus by a very large body size (more than 20,000 μm for N. unicum gen. et sp. nov. and more than 9000 μm for N. gracilis gen. et sp. nov.) and the presence of a pronounced circle of short cervical setae. Data on the nearly full length of the 18S rDNA, D1-D3 and D8-D10 domains of the 28S rDNA and ITS/5.8S and cox1 mtDNA nucleotide sequences were obtained. A phylogenetic analysis of the family Thoracostomopsidae was carried out using data on the nucleotide sequences of nuclear DNA of representatives of all three subfamilies (Thoracostominae, Enoplolaiminae, and Trileptiinae). The results of phylogenetic analysis did not confirm the monophyly of the last two subfamilies and many genera.

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两种胸孔虫科新种（线虫、线虫）的综合描述及对线虫针状体起源的简要讨论

摘要-胸腹线虫科的线虫在世界海洋中普遍存在。在堪察加半岛东海岸的潮下底部沉积物中发现了两种。提供了三棱属的分类修订。建立了新属Neotrileptium gen. 11 .，并描述了新种Neotrileptium gracilis gen. et sp. 11和Neotrileptium unicum gen. et sp. 11两个新种。Neotrileptium gen.nov。显示了胸口科的所有主要特征，但在下颌复合体的形状和位置上与所有已知的胸口科不同（位于一个宽敞的颊腔中）。该新种与该属其他物种的不同之处是体型非常大（N. unicum gen. et sp. 11 .超过20,000 μm， N. gracilis gen. et sp. 11 .超过9000 μm），并且存在明显的短颈刚毛圈。获得了18S rDNA的近全长、28S rDNA的D1-D3和D8-D10结构域以及ITS/5.8S和cox1 mtDNA核苷酸序列的数据。利用3个亚科（胸口蝗科、Enoplolaiminae和Trileptiinae）代表的核DNA核苷酸序列数据对胸口蝗科进行了系统发育分析。系统发育分析结果未证实最后两个亚科和许多属的单系性。

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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.