REPRODUCTION AND DEVELOPMENT OF THE HERMAPHRODITIC SEA-STAR,ASTERINA MINORHAYASHI
| Autor: | Yasuo T. Kano, Chitaru Oguro, Miéko Komatsu, Shoji Akabane, Hideki Yoshizawa |
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| Rok vydání: | 1979 |
| Předmět: | |
| Zdroj: | The Biological Bulletin. 157:258-274 |
| ISSN: | 1939-8697 0006-3185 |
| DOI: | 10.2307/1541053 |
| Popis: | 1. The breeding season of Asterina minor is estimated to be during the month of May in Kushimoto, Japan. A. minor shows a characteristic breeding assemblage and the eggs are laid on the substratum in a mass spawning. The eggs are not protected by the adults.2. A. minor is a spatial hermaphrodite, where ovaries and testes in an individual become mature simultaneously. Isolated individuals are capable of self-fertilizing and the self-fertilized eggs develop normally.3. The spawned eggs are spherical, yellow, and 437 µm in average diameter. They attach to the substratum with a sticky jelly layer. Cleavage is total and radial.4. Eggs through the wrinkled blastula stage develop into a pear-shaped brachiolaria bearing three brachiolar arms within the fertilization membrane.5. About four days after spawning, the brachiolariae hatch from the fertilization membrane and creep on the substratum with well-developed brachiolar arms. There is no evidence of pelagic life in the present species.6. One day after hatching,... |
| Databáze: | OpenAIRE |
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