Ultrastructure of Sperm Development and Mature Sperm Morphology in Spondylus calcifer and S. Princeps (Bivalvia: Spondylidae)

IF 0.7 4区生物学 Q4 ZOOLOGY

Malacologia Pub Date : 2018-05-30 DOI:10.4002/040.062.0102

M. Villalejo-Fuerte, M. A. Camacho-Mondragón, B. Ceballos-Vázquez, E. O. López-Villegas, Esther Uría-Galicia, M. Arellano-Martínez

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引用次数: 3

Abstract

ABSTRACT The entire spermatogenesis process and the presence of accessory cells in sperm development in Spondylus princeps Broderip, 1833, and S. calcifer Carpenter, 1857, were described for the first time. Spermatogenesis in both species showed similar anatomical and ultrastructural features. The testis contained amoeboid somatic cells inside the acini, frequently associated with developing gametes. Overall, spermatogenesis followed the typical pattern reported for other bivalve species, except for a few specific details. In S. princeps, intercellular bridges between spermatogonia, as well as one spermatocyte with seven mitochondria were observed. Both species had mature sperm of the ect-aquasperm type, consisting of a head, which contains a spherical-pyriform nucleus and a conical acrosome bounded by two regions of different density, four spherical mitochondria and two centrioles in the middle piece; the flagellum showed a standard 9 + 2 microtubule arrangement.

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钙化脊柱鱼和大头脊柱鱼精子发育和成熟精子形态的超微结构

本文首次描述了1833年和1857年的Spondylus princeps Broderip和S. calcifer Carpenter的精子发育过程中的整个精子发生过程和辅助细胞的存在。两个物种的精子发生具有相似的解剖和超微结构特征。睾丸在腺泡内含有变形虫体细胞，通常与发育中的配子有关。总的来说，精子发生遵循了其他双壳类物种的典型模式，除了一些特定的细节。在太子参中，观察到精原细胞之间的细胞间桥，以及一个精母细胞与七个线粒体。这两种植物都有异水精型的成熟精子，包括一个头部，其中包含一个球形梨形核和一个圆锥形顶体，顶体由两个不同密度的区域包围，四个球形线粒体和中间的两个中心粒;鞭毛呈标准的9 + 2微管排列。

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

Malacologia 生物-动物学

CiteScore

2.00

自引率

0.00%

发文量

审稿时长

3 months

期刊介绍： Malacologia publishes papers on all groups of the Mollusca. Malacologia specializes in publishing long papers and monographic treatments. Complete data are especially appreciated. Papers must be of interest to an international readership. Papers in systematics, ecology, population ecology, genetics, molecular genetics, evolution and phylogenetic treatments are especially welcomed. Also welcomed are letters to the editor involving papers published or issues of import to science of the day.