An evolutionary paradox on threadsnakes: Phenotypic and molecular evidence reveal a new and remarkably polymorphic species of Siagonodon (Serpentes: Leptotyphlopidae: Epictinae) from Amazonia

IF 2.4 2区 生物学 Q1 ZOOLOGY
Angele Martins, Manuella Folly, Guilherme Nunes Ferreira, Antônio Samuel Garcia da Silva, C. Koch, Antoine Fouquet, A. Machado, R. Lopes, R. Pinto, M. Rodrigues, Paulo Passos
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引用次数: 1

Abstract

Threadsnakes are known for their conserved external morphology and historically controversial systematics, challenging taxonomic, biogeographic and evolutionary researches in these fields. Recent morphological studies—mostly based on µCT data of the skull and lower jaw—have resolved systematic issues within the group, for instance leading to the description of new taxa or re-positioning little-known scolecophidian taxa in the tree of life. Herein we describe a new polymorphic species of the genus Siagonodon from Amazonia based on morphological (external, osteology and hemipenis) and molecular data, and provide the first hemipenial description for the genus. We also reassign Siagonodon acutirostris to the genus Trilepida based on osteological data in combination with molecular evidence. The new species described represents an evolutionary paradox for scolecophidians because the species displays a remarkable variation in the shape of the snout region that is otherwise always highly conserved in this clade. Finally, this study reinforces the importance of protected areas as essential in maintaining vertebrate populations, including those that are not yet formally described.
线蛇的进化悖论:表型和分子证据揭示了亚马逊地区一种新的、具有显著多态性的暹罗齿龙(蛇科:细齿龙科:Epitinae)
响尾蛇以其保守的外部形态和历史上有争议的系统学而闻名,这对这些领域的分类学、生物地理学和进化研究具有挑战性。最近的形态学研究——主要基于头骨和下颌的µCT数据——解决了该类群内的系统性问题,例如,导致对新分类群的描述,或在生命树中重新定位鲜为人知的Scolechophidia分类群。在此,我们根据形态学(外部、骨学和半阴茎)和分子数据描述了亚马逊地区暹罗齿龙属的一个新的多态物种,并首次对该属进行了半阴茎描述。根据骨物学数据和分子证据,我们还将尖齿暹罗重新归类为三叶龙属。所描述的新物种代表了Scolechophidians的一个进化悖论,因为该物种在吻部区域的形状上表现出显著的变化,而在这个分支中,吻部区域在其他方面总是高度保守的。最后,这项研究强调了保护区在维持脊椎动物种群(包括尚未正式描述的脊椎动物种群)方面的重要性。
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来源期刊
CiteScore
4.00
自引率
19.00%
发文量
42
审稿时长
>12 weeks
期刊介绍: Research fields covered by VERTEBRATE ZOOLOGY are ta‍xo‍no‍my, mor‍pho‍logy, an‍at‍omy, phy‍lo‍ge‍ny (mo‍le‍cu‍lar and mor‍pho‍lo‍gy-based), hi‍sto‍ri‍cal bio‍geo‍gra‍phy, and pa‍lae‍on‍to‍lo‍gy of ver‍te‍bra‍tes.
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