In the evolution of ascidians different reproductive strategies operated. One of the most important aspects was the passage from external to internaI fertilization and then from ovipaIity to ovovivipaIity and viviparity with consequent morpho-functional modifications to organs and gametes. This paper presents a short review on the ovary and oviduct, the plasticity of which had pIayed a cri tic role in permitting the evolutive changes of sexual reproduction.
Sexual reproduction in ascidians: comparative aspects of oviduct, ovulation and spawning
ZANIOLO, GIOVANNA;MANNI, LUCIA;BURIGHEL, PAOLO
1994
Abstract
In the evolution of ascidians different reproductive strategies operated. One of the most important aspects was the passage from external to internaI fertilization and then from ovipaIity to ovovivipaIity and viviparity with consequent morpho-functional modifications to organs and gametes. This paper presents a short review on the ovary and oviduct, the plasticity of which had pIayed a cri tic role in permitting the evolutive changes of sexual reproduction.
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