The sperm structure of Clinidium canaliculatum (Costa): A contribution to the systematic position of Rhysodidae (Coleoptera: Carabidae)

IF 1.7 3区 农林科学 Q2 ENTOMOLOGY Arthropod Structure & Development Pub Date : 2024-01-01 DOI:10.1016/j.asd.2023.101330
Anita Giglio , David Mercati , Pietro Lupetti , Pietro Brandmayr , Romano Dallai
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Abstract

The systematic position and the phylogenetic relationship of Rhysodidae members is still debated, with some authors considering the group as a separate family of Adephaga, while for others they could be a subfamily of Carabidae. The group have morphological traits quite different from Carabidae and an aberrant behaviour compared to ground beetles being not predaceous. The sperm ultrastructure of C. canaliculatum was studied comparatively with other species of beetles, Carabidae in particular. The results indicate that the sperm structure of this species is similar to that of the Carabinae species. As in these species, C. canaliculatum has sperm conjugates with an apical conical cap protecting the heads and the initial region of flagella. This sperm appearance is also shared by another species of Rhysodidae, Omoglymmius hamatus. The material of the apical cap consists of an electron-dense material with a peculiar outer net configuration. Many species of Carabidae, however, can present a different type of sperm conjugation, the spermatostyle: a long rod-like structure where the individual sperms have only the most apical part inserted in the cortical area and the flagella are completely free. C. canaliculatum sperm are endowed with a mono-layered acrosome, a nucleus of variable shape along its length, a flagellum consisting of a typical axoneme 9 + 9+2, provided with 16 protofilaments in the tubular wall of accessory tubules, two asymmetric mitochondrial derivatives with the left one larger than the opposite one, and the right accessory body elongated and larger than the opposite one. These sperm characteristics, which are shared also by another member of the group, suggest the demotion of the family Rhysodidae to the subfamily Rhysodinae within Carabidae, a result also supported by recent molecular data.

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Clinidium canaliculatum (Costa) 的精子结构:对Rhysodidae (Coleoptera: Carabidae) 系统定位的贡献
Rhysodidae成员的系统定位和系统发育关系仍存在争议,一些作者认为该类是Adephaga的一个独立科,而另一些作者则认为它们可能是Carabidae的一个亚科。该类昆虫的形态特征与食肉目(Carabidae)迥然不同,而且与地甲虫相比行为反常,不会捕食。研究人员将 C. canaliculatum 的精子超微结构与其他种类的甲虫(尤其是腕足动物)进行了比较。结果表明,该物种的精子结构与食肉目物种相似。与这些物种一样,C. canaliculatum 的精子具有顶端圆锥形帽,保护头部和鞭毛的初始区域。Rhysodidae 的另一个物种 Omoglymmius hamatus 也具有这种精子外观。顶端锥形帽的材料由电子致密材料组成,具有奇特的外网结构。然而,鲤科的许多物种可以呈现出一种不同的精子结合类型,即精柱:一种长杆状结构,单个精子只有最顶端的部分插入皮层区域,鞭毛则完全游离。C. canaliculatum 的精子具有单层顶体、沿长度方向形状各异的细胞核、由典型轴丝 9 + 9 + 2 组成的鞭毛(在附属管的管壁上有 16 根原丝)、两个不对称的线粒体衍生物(左侧的线粒体衍生物大于对侧的线粒体衍生物,右侧的附属体拉长且大于对侧的附属体)。这些精子特征也为该类群的另一成员所共有,这表明Rhysodidae科被降级为胭脂鱼科中的Rhysodinae亚科,最近的分子数据也支持这一结果。
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来源期刊
CiteScore
3.50
自引率
10.00%
发文量
54
审稿时长
60 days
期刊介绍: Arthropod Structure & Development is a Journal of Arthropod Structural Biology, Development, and Functional Morphology; it considers manuscripts that deal with micro- and neuroanatomy, development, biomechanics, organogenesis in particular under comparative and evolutionary aspects but not merely taxonomic papers. The aim of the journal is to publish papers in the areas of functional and comparative anatomy and development, with an emphasis on the role of cellular organization in organ function. The journal will also publish papers on organogenisis, embryonic and postembryonic development, and organ or tissue regeneration and repair. Manuscripts dealing with comparative and evolutionary aspects of microanatomy and development are encouraged.
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