Integrated evidence sheds light on the taxonomy of the widespread Tantilla melanocephala species complex (Serpentes: Colubridae) and indicates the existence of a new species from southern South America

IF 1.9 3区 生物学 Q3 EVOLUTIONARY BIOLOGY
Weverton dos Santos Azevedo, Francisco Luís Franco, Lucas Menezes, Tobias Saraiva Kunz, Felipe Gobbi Grazziotin
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引用次数: 0

Abstract

The widespread Tantilla melanocephala is a South American snake, which has a convoluted taxonomic history and a poorly addressed systematics. The taxonomic identity and the phylogenetic affinities of their populations are unclear, suggesting the existence of a complex of undescribed species. Here, we preliminarily address the morphological diversity and genetic structure of the T. melanocephala complex through comparative morphological approaches and phylogenetic analyses using maximum likelihood. Our results confirm the presence of hidden diversity within the T. melanocephala complex and strongly indicate that the populations of T. melanocephala from southern South America represent a distinct lineage, which is morphologically diagnosable under a unique combination of character states. Therefore, we formally describe these populations as a new species and present a comparison among all other South American species of Tantilla. We also estimate the divergence times of the main clades within the complex through Bayesian analysis, suggesting a biogeographical scenario of lineage diversification. Finally, our study clarifies aspects of the intricate taxonomy of the T. melanocephala complex, providing a framework for future studies to avoid the description of synonyms.

Abstract Image

综合证据揭示了广泛分布的 Tantilla melanocephala 物种群(蛇类:眼镜蛇科)的分类学,并表明南美洲南部存在一个新物种
广布于南美洲的 Tantilla melanocephala 是一种蛇类,其分类学历史错综复杂,系统学也没有得到很好的研究。其种群的分类学特征和系统发育亲缘关系尚不清楚,这表明存在一个未被描述的物种群。在这里,我们通过比较形态学方法和使用最大似然法进行系统发生分析,初步探讨了 T. melanocephala 复合体的形态多样性和遗传结构。我们的研究结果证实了T. melanocephala复合体内部存在隐藏的多样性,并有力地表明南美洲南部的T. melanocephala种群代表了一个独特的品系,其形态学上的特征状态组合是独一无二的。因此,我们正式将这些种群描述为一个新物种,并将其与所有其他南美洲 Tantilla 物种进行比较。我们还通过贝叶斯分析估算了该复合体中主要支系的分化时间,提出了一个生物地理学上的世系分化情景。最后,我们的研究澄清了 T. melanocephala 复合体错综复杂的分类学问题,为今后的研究提供了一个框架,避免了同义词的描述。
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来源期刊
Organisms Diversity & Evolution
Organisms Diversity & Evolution 生物-进化生物学
CiteScore
3.60
自引率
0.00%
发文量
56
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.
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