High diversity and population structure in a widespread tarantula Sickius longibulbi (Mygalomorphae: Theraphosidae)

IF 1.5 3区生物学 Q2 ZOOLOGY

Zoologischer Anzeiger Pub Date : 2025-08-23 DOI:10.1016/j.jcz.2025.08.007

Beatriz B. Groppo, Millke Jasmine A. Morales, Tiago Belintani, José Paulo L. Guadanucci

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引用次数: 0

Abstract

Sickius Soares & Camargo, 1948 is a monotypic genus (Sickius longibulbi) characterized by a broad geographic distribution across Brazil and conservative morphology. Notably, females lack spermathecae, and males possess palpal bulb with a long embolus, both traits with taxonomic importance. The genus belongs to the infraorder Mygalomorphae, a group with intricate taxonomic challenges due to uniform morphology, complicating species delimitation. In the present study, we employed an integrative taxonomic approach, combining mitochondrial DNA sequences of the Cytochrome Oxidase I (COI) gene with Fourier Elliptical Analysis of the male palpal bulb shape to investigate lineage differentiation and evolutionary patterns within the genus Sickius. We observed genetic structured populations along with morphometric variation and geographic distribution, except for the two lineages localized in northeast Cerrado. We retain S. longibulbi as a single species with great diversity and possibly undergoing a process of divergence. Future studies with larger sample sizes are encouraged to confirm these findings and further investigate the evolutionary history of the genus.

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一种广布狼蛛的种群结构及其多样性（mygalomorae: Theraphosidae）

Sickius Soares & Camargo， 1948是一个单型属（Sickius longibulbi），其特征是在巴西广泛的地理分布和保守的形态。值得注意的是，雌性没有精囊，而雄性有带长栓子的掌球，这两个特征在分类学上都很重要。该属属于下目Mygalomorphae，由于形态统一，物种划分复杂，分类困难。在本研究中，我们采用综合分类方法，结合细胞色素氧化酶I （COI）基因的线粒体DNA序列和雄性掌球形状的傅里叶椭圆分析来研究镰刀属的谱系分化和进化模式。除了塞拉多东北部的两个世系外，我们观察了遗传结构群体以及形态变异和地理分布。我们保留了长茎草作为一个单一的物种，具有很大的多样性，可能正在经历一个分化的过程。鼓励未来更大样本量的研究来证实这些发现，并进一步研究该属的进化史。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Zoologischer Anzeiger 生物-动物学

CiteScore

2.80

自引率

7.10%

发文量

审稿时长

>12 weeks

期刊介绍： Zoologischer Anzeiger - A Journal of Comparative Zoology is devoted to comparative zoology with a special emphasis on morphology, systematics, biogeography, and evolutionary biology targeting all metazoans, both modern and extinct. We also consider taxonomic submissions addressing a broader systematic and/or evolutionary context. The overall aim of the journal is to contribute to our understanding of the organismic world from an evolutionary perspective. The journal Zoologischer Anzeiger invites suggestions for special issues. Interested parties may contact one of the editors.