Abstract

The spermatozoon of hair worm Gordius panighettensis (Nematomorpha, Gordioidea) has been studied under the electron microscope in the male genital tract. This immotile, rod-like sperm is made up of an acrosomal complex and an elongated nucleus with chromatin condensed in the central part. Both the acrosomal complex and the nucleus are surrounded by vesicular structures varying in complexity. This aberrant spermatozoon appears to have no equivalent in the zoological scale.

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