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REPRODUCTIVE SYSTEM OF THE PARASITIC COPEPOD PACHYPYGUS GIBBER: SPERMATOGENESIS AND SPERMATOPHORE FORMATION IN DIMORPHIC MALES, AND DISCHARGE IN FEMALE TRACTS

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ABSTRACT An ultrastructural comparison of the spermatogenesis of dimorphic males of Pachypygus gibber has been made. After maturation, the spermatozoon is identical in the two males. It appears as a cell in which nucleoplasm and cytoplasm are mixed, with an important densification zone composed of a homogeneous zone and a zone with a paracrystalline organization. The nature of this structure recalls an acrosomal complex. An original feature is the wrapping of the spermatozoon around a vesicle which could have either a nutritive role or a role as sperm carrier involved in the transport to the female genital tracts. Data concerning the copulatory behavior of the two males and of the female genital system are given. The modifications of the sperm observed in the female tracts could be linked to capacitation mechanisms before fertilization. We conclude that the different steps in spermatogenesis are the same in the two males of Pachypygus and that they lead to only one type of spermatozoon and consequently to only one type of fertilized egg.

10.1163/193724089X00052
/content/journals/10.1163/193724089x00052
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/content/journals/10.1163/193724089x00052
2017-08-19

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