Systematics of Neotropical electric knifefish Tembeassu (Gymnotiformes, Apteronotidae)

IF 1.8 3区环境科学与生态学 Q2 BIODIVERSITY CONSERVATION

Systematics and Biodiversity Pub Date : 2022-03-17 DOI:10.1080/14772000.2022.2032460

L. Peixoto, R. Campos-da-Paz, N. Menezes, C. D. D. Santana, M. Triques, A. Datovo

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引用次数: 0

Abstract

A new species of the poorly known and critically endangered ghost knifefish Tembeassu is described from the upper Paraná and Araguari rivers, Brazil, using external anatomy and X-ray microcomputed tomography (µCT scan). Tembeassu titanicus sp. nov. is distinguished from its sole congener, T. marauna, by a unique set of morphometric and meristic characters, in addition to the absence of a tooth patch at the anterior portion of the roof of the oral cavity and the external corner of the mouth slightly passing the vertical through the posterior margin of the posterior nare. To test the monophyly of Tembeassu and reassess its phylogenetic position, a total-evidence approach was performed through a Bayesian inference (BI) and maximum-parsimony analysis (MP). Our results indicate that Tembeassu is monophyletic and the sister taxon of a clade formed by Apteronotus s.s., Megadontognathus, and Parapteronotus (BI); or as part of a large polytomy at the base of Apteronotidae (MP). Species of Tembeassu co-occur in the Paraná River basin, and the absence of the patch of accessory teeth in T. titanicus sp. nov. may indicate that this species accesses a different food resource, and also putatively occupies a different habitat than T. marauna. Comments on the evolution of the mandibular lobe in Gymnotiformes, dentition pattern in Tembeassu, and apteronotid diversity in the Paraná River are provided. http://zoobank.org/urn:lsid:zoobank.org:act:691CB9A5-5CDB-4BF9-8A6FEAE877563C12

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新热带电刀鱼Tembeassu的系统学（Gymnotiformes，Apteronotiae）

利用外部解剖和x射线微计算机断层扫描(µCT扫描)，研究人员在巴西的帕拉南和阿拉瓜里河上游描述了一种鲜为人知且极度濒危的鬼刀鱼Tembeassu。Tembeassu titanicus sp. 11 .区别于它唯一的同系物，T. marauna，除了在口腔顶部的前部和口腔的外角稍微垂直穿过后颚的后缘没有牙齿斑块外，还有一组独特的形态和分生特征。为了检验Tembeassu的单系性并重新评估其系统发育位置，我们采用了贝叶斯推理(BI)和最大简约分析(MP)的全证据方法。结果表明，Tembeassu属单系，是由Apteronotus s.s.、Megadontognathus和Parapteronotus (BI)组成的分支的姐妹类群;或作为翼龙科(MP)基部的大息肉的一部分。Tembeassu在帕拉那河流域共存，泰坦泰坦的副齿斑块的缺失可能表明该物种获得了不同的食物资源，也可能与marauna占据不同的栖息地。本文对裸子目动物下颚叶的进化、Tembeassu的齿列模式和paran河的翼类多样性进行了评述。http://zoobank.org/urn:lsid:zoobank.org:act:691CB9A5-5CDB-4BF9-8A6FEAE877563C12

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来源期刊

Systematics and Biodiversity 环境科学-生物多样性保护

CiteScore

4.10

自引率

0.00%

发文量

审稿时长

>24 weeks

期刊介绍： Systematics and Biodiversity is devoted to whole-organism biology. It is a quarterly, international, peer-reviewed, life science journal, without page charges, which is published by Taylor & Francis for The Natural History Museum, London. The criterion for publication is scientific merit. Systematics and Biodiversity documents the diversity of organisms in all natural phyla, through taxonomic papers that have a broad context (not single species descriptions), while also addressing topical issues relating to biological collections, and the principles of systematics. It particularly emphasises the importance and multi-disciplinary significance of systematics, with contributions which address the implications of other fields for systematics, or which advance our understanding of other fields through taxonomic knowledge, especially in relation to the nature, origins, and conservation of biodiversity, at all taxonomic levels. The journal does not publish single species descriptions, monographs or applied research nor alpha species descriptions. Taxonomic manuscripts must include modern methods such as cladistics or phylogenetic analysis.