2 Sentences With "vesiculae"

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The Acanthocephala are dioecious (an individual organism is either male or female). There is a structure called the genital ligament which runs from the posterior end of the proboscis sheath to the posterior end of the body. In the male, two testes lie on either side of this. Each opens in a vas deferens which bears three diverticula or vesiculae seminales.
B. balanus is a cross-fertilising hermaphrodite and the single brood of nauplii is produced in the middle of winter. In mature individuals (barnacles at least ten millimetres in diameter) the white vesiculae seminales are very much enlarged at this time and filled with spermatozoa, occupying much of the body cavity and the penis is also greatly enlarged. At the same time, a creamy mass of eggs are present in the ovarian tubules. Fertilisation takes place over the course of a few days in each group of barnacles and the fertilised eggs change to an orange colour and then to a greyish-brown as the nauplii develop.