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A taxonomic conundrum: Characterizing a cryptic radiation of Asian gracile skinks (Squamata: Scincidae: Riopa) in Myanmar.
Molecular Phylogenetics and Evolution ( IF 3.6 ) Pub Date : 2020-02-03 , DOI: 10.1016/j.ympev.2020.106754
Elyse S Freitas 1 , Aryeh H Miller 2 , R Graham Reynolds 2 , Cameron D Siler 1
Affiliation  

Recognizing species-level diversity is important for studying evolutionary patterns across biological disciplines and is critical for conservation efforts. However, challenges remain in delimiting species-level diversity, especially in cryptic radiations where species are genetically divergent but show little morphological differentiation. Using multilocus molecular data, phylogenetic analyses, species delimitation analyses, and morphological data, we examine lineage diversification in a cryptic radiation of Riopa skinks in Myanmar. Four species of Riopa skinks are currently recognized from Myanmar based on morphological traits, but the boundaries between three of these species, R. anguina, R. lineolata, and R. popae, are not well-defined. We find high levels of genetic diversity within these three species. Our analyses suggest that they may comprise as many as 12 independently evolving lineages, highlighting the extent to which species diversity in the region is underestimated. However, quantitative trait data suggest that these lineages have not differentiated morphologically, possibly indicating that this cryptic radiation represents non-adaptive evolution, although additional data is needed to corroborate this.

中文翻译:

一个分类学难题:表征缅甸的亚洲细纹石龙鱼(鳞片:Scincidae:Riopa)的隐秘辐射。

认识到物种一级的多样性对于研究跨生物学学科的进化模式非常重要,对于保护工作也至关重要。但是,在界定物种层面的多样性方面仍然存在挑战,尤其是在隐性辐射中,物种在遗传上是发散的,但几乎没有形态分化。使用多基因座分子数据,系统发育分析,物种定界分析和形态学数据,我们检查了缅甸里奥帕石ks的隐秘辐射中的谱系多样性。根据形态特征,目前从缅甸识别出四种Riopa石皮鱼,但其中3种(安圭纳河(R. anguina),R。lineolata和R. popae)之间的界限尚不明确。我们发现这三个物种中的遗传多样性水平很高。我们的分析表明,它们可能包含多达12个独立演化的谱系,突显了该地区物种多样性被低估的程度。但是,数量性状数据表明这些谱系在形态上没有区别,可能表明这种隐性辐射代表了非适应性进化,尽管需要更多的数据来证实这一点。
更新日期:2020-02-03
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