Letter | Published:

Homologies of the Genital Ducts of Insects

Naturevolume 115page763 (1925) | Download Citation



IT is unfortunate that even the most recent text-books of entomology are not up-to-date in their accounts of the above organs. It is only with regard to the ectodermal parts of the ducts that opinions have differed; otherwise it is admitted by all that ovaries and oviducts correspond to the testes and vasa deferentia respectively. In every book, old or new, one finds the median ejaculatory duct homologised with the median vagina. This homology is open to serious objection: the ejaculatory duct opens in all insects, excepting the Ephemeroptera, behind the ninth sternite, and is unpaired from the very beginning, while the vagina or the uterus opens in most insects between the eighth and ninth sterna, and is paired in origin in many orders.

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  1. Zoological Laboratory, Cambridge



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