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Updated: May 8, 2025
There are a great many animals, from jelly-fishes to fishes and frogs, in which fertilisation is external, and there are no intromittent organs at all. Certain organs on the head and pelvic fins of the Chimaeroid fishes are believed to be used for this purpose. WEAPONS. Organs which are employed in combats between males for the exclusive possession of the females.
As I pointed out in my Sexual Dimorphism , the common characteristic of somatic sexual characters is their adaptive relation to some function in the sexual habits of the species in which they occur. All other differences, therefore, including genital ducts and copulatory or intromittent organs, are somatic.
GENITAL DUCTS AND INTROMITTENT ORGANS. According to the theory of the coelom which we owe to Goodrich, in all the coelomata the coelom is primarily the generative cavity, on the walls of which the gametocytes are situated, and the coelomic ducts are the original genital ducts.
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