A new Loriciferan, Scaberiloricus samba gen. et sp. nov., links the Higgins larva and the aberrant Shira larva

IF 1.9 3区生物学 Q3 EVOLUTIONARY BIOLOGY

Organisms Diversity & Evolution Pub Date : 2023-11-09 DOI:10.1007/s13127-023-00626-7

Martin V. Sørensen, Maria Herranz, Ricardo C. Neves, Reinhardt M. Kristensen, André R. S. Garraffoni

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Abstract

Abstract A new genus and species of Loricifera, Scaberiloricus samba gen. et sp. nov., is described from the continental shelf and slope off Rio de Janeiro, Brazil. Adult morphology remains unknown for the new entity, but information is available from three different Higgins larval instars. The Higgins larva of the new species is characterised by a bulbous head and a slender, elongate trunk, separated by a constriction behind the head. The cuticle of the thorax and the posterior part of the head is characterised by numerous longitudinal zigzag folds. The new species and genus shows greatest morphological resemblance with Wataloricus japonicus , and a phylogenetic analysis based on Higgins larval morphological characters suggests that Scaberiloricus gen. nov., Wataloricus , Tenuiloricus , and Patuloricus form a monophyletic group within Pliciloricidae. The analysis furthermore suggests that the Higgins larvae of Scaberiloricus gen. nov. and Wataloricus represent transitional, evolutionary stages towards the highly aberrant Shira larvae, found in species of Tenuiloricus and Patuloricus .

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一种新的蛛形目Scaberiloricus samba gen. et sp. nov.将希金斯幼虫和异常的Shira幼虫联系起来

摘要在巴西里约热内卢里约热内卢的大陆架和斜坡上描述了一新属和新种:Scaberiloricus samba gen. et sp. nov.。新实体的成虫形态尚不清楚，但可以从三种不同的希金斯幼虫中获得信息。新物种的希金斯幼虫的特征是一个球根状的头部和一个细长的躯干，由头部后面的收缩分开。胸部和头部后部的角质层有许多纵向的锯齿状褶皱。该新种属的形态特征与日本野田鼠(Wataloricus japonicus)最为相似。基于Higgins幼虫形态特征的系统发育分析表明，日本野田鼠(Scaberiloricus gen. nov.)、野田鼠(Wataloricus)、田鼠(Tenuiloricus)和Patuloricus在野田鼠科属于一个单系类群。进一步分析表明，Scaberiloricus gen. 11 .和Wataloricus的Higgins幼虫代表了向Tenuiloricus和Patuloricus中高度异常的Shira幼虫过渡的进化阶段。

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来源期刊

Organisms Diversity & Evolution 生物-进化生物学

CiteScore

3.60

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： Organisms Diversity & Evolution (published by the Gesellschaft fuer Biologische Systematik, GfBS) is devoted to furthering our understanding of all aspects of organismal diversity and evolution. Papers addressing evolutionary aspects of the systematics, phylogenetics, morphology and development, taxonomy and biogeography of any group of eukaryotes, recent or fossil, are welcome. Priority is given to papers with a strong evolutionary and/or phylogenetic focus. Manuscripts presenting important methods or tools or addressing key theoretical, methodological, and philosophical principles related to the study of organismal diversity are also welcome. Species descriptions are welcome as parts of a manuscript of broader interest that strive to integrate such taxonomic information with the other areas of interest mentioned above.