ABSTRACT This study detailed the histomorphology of the male reproductive system and seasonality in the reproduction of a recently described genus and species of freshwater crab Arcithelphusa cochleariformis. Results indicated that the testis and vas deferens underwent correlative changes in accord with the active, inactive and revival phases of spermatogenesis. The spermatogenic activity was at its peak during June evinced from large fully extended acini with full package of mature spermatozoa and low during September–February with decreased acinar dimensions, pycnotic germ cells and residual sperms. Seasonal cyclicity was also observed in the thickness of epithelium, muscle layer, diameter of lumen and the amount of luminal contents of the vas deferens. In June, the anterior and middle vas deferenswere filled with secretions and spermatophores.By September, ruptured spermatophores with freely dispersed pycnotic spermatozoa were perceptible in the anterior and middle vas deferens and lysed spermatophoric debris in posterior vas deferens.

中文翻译：

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淡水蟹 Arcithelphusa cochleariformis (Brachyura: Gecarcinucidae) 雄性生殖系统的形态和繁殖的季节性

摘要 本研究详细介绍了最近描述的淡水蟹 Arcithelphusa cochleariformis 属和种繁殖过程中雄性生殖系统的组织形态学和季节性。结果表明，睾丸和输精管根据精子发生的活跃期、非活跃期和复苏期发生了相关的变化。生精活动在 6 月达到顶峰，表现为大的完全伸展的腺泡和完整的成熟精子包装，而在 9 月至 2 月则较低，腺泡尺寸减少、固缩生殖细胞和残留精子。在上皮厚度、肌肉层、管腔直径和输精管管腔内容物的数量上也观察到季节性周期性。六月，前、中输精管充满分泌物和精囊。