Abstract
The comparative spermatology of 4 strepsipteran species, namely, Xenos moutoni De Buysson, Elenchus tenuicornis (Kirby), Elenchus japonicus Esaki and Hashimoto and Halictophagus chilensis Hofmann, have been studied by transmission electron microscopy. The spermatozoon of all 4 species examined were seen to have: an elongated head characterized by a nucleus with an internal channel of uncondensed chromatin, a one-layered acrosome, and a tail containing a 9 + 9 + 2 axoneme and 2 partially crystallized mitochondrial derivatives. Each sperm, nevertheless, shows a few peculiarities that confirm the taxonomic value of comparative spermatology. In addition, the strepsipteran spermatozoa were seen to have a different organization to that of Pelecotoma fennica Pewkull (Rhipiphoridae, Pelecotominae), which has the typical structure of a coleopteran sperm. It was characterized by a 3-layered acrosomal complex, a tail with a 9 + 9 + 2 axoneme flanked by 2 accessory bodies and 2 mitochondrial derivatives. From the spermatological point of view, primitive Coleoptera cannot be considered to be closely related to Strepsiptera.
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