Comparative sperm morphology of 15 species of limpet (Mollusca: Patellogastropoda: Lottioidea) and correlation with current systematics and phylogenies

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Accounts of Chemical Research Pub Date : 2024-07-03 DOI:10.1093/mollus/eyae023

Alan N Hodgson, John Buckland-Nicks

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Abstract

The spermatozoa of 14 species (four genera) of Lottiidae and one species of Acmaeidae are described by transmission electron microscopy. All have ect-aquasperm, which are relatively small, morphologically simple, free-swimming sperm produced by species with external fertilization. Based on the size, shape and structure of the nucleus and acrosome, as well as features of the mid-piece, several morphological sperm ‘types’ are recognized within the species of Lottioidea described by the present and several previous studies. Sperm morphology largely supports current taxonomy as well as systematic and phylogenetic relationships. However, the morphology of the sperm of Lottia dorsuosa suggests that its generic status should be re-examined. The sperm morphology of Niveotectura pallida (formerly Acmaea pallida) is more similar to that of species of Tectura than of Acmaea mitra, supporting the current placement of N. pallida in the Lottiidae. This result is at odds with the close relationship between N. pallida and A. mitra indicated by recent phylogenies based on molecular data.

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15 种瓣鳃目（软体动物门：腹足纲：瓣鳃目）精子形态比较以及与当前系统学和系统发育的相关性

通过透射电子显微镜描述了 14 种（4 属）Lottiidae 和 1 种 Acmaeidae 的精子。所有物种都有外生精子，这是一种相对较小、形态简单、自由游动的精子，由具有外部受精能力的物种产生。根据细胞核和顶体的大小、形状和结构，以及中段的特征，在本研究和之前的一些研究中描述的 Lottioidea 物种中可以识别出几种形态学上的精子 "类型"。精子形态在很大程度上支持当前的分类以及系统和系统发育关系。然而，Lottia dorsuosa精子的形态表明其属种地位应重新审查。Niveotectura pallida（前身为 Acmaea pallida）的精子形态与 Tectura 的物种更为相似，而与 Acmaea mitra 的精子形态更为相似，这支持目前将 N. pallida 归入 Lottiidae 的观点。这一结果与最近基于分子数据的系统发育所显示的 N. pallida 与 A. mitra 之间的密切关系不符。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.

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