12 research outputs found
Cheilostomatous Bryozoa from the Kurile Islands and the Neighbouring Districts
Volume: 10Start Page: 113End Page: 13
Development and metamorphosis of the cyphonautes larva of Membranipora serrilamella Osburn
Membranipora serrilamella Osburn is very abundant on Japanese edible kelp Laminaria japonica Areshoug. Protandric gametogenesis, discharge of matured eggs and external fertilization were observed in the aquarium. Total-equal type of cleavage, formation of embryo, change of egg-membrane into shells of Cyphonautes were ascertained under the microscope. Morphology, behavior and settlement of larva and its metamorphosis into a twin-ancestrula and also early colonial formation were studied.Membranipora serrilamella Osburn est trĂšs abondant sur le Laminaria japonica Areshoug, varech japonais comestible. La gametogenĂšse protandrique, la libĂ©ration des oeufs mĂ»rs et la fertilisation externe ont Ă©tĂ© observĂ©es en aquarium. La division de type total-Ă©gal, la formation de l'embryon, la transformation de la membrane de l'oeuf en coquille de Cyphonautes ont Ă©tĂ© constatĂ©es au microscope. La morphologie, le comportement et la fixation de la larve, sa mĂ©tamorphose en une ancestrule double et aussi les premiers stades de la colonie ont Ă©tĂ© Ă©tudiĂ©s.Mawatari Shizuo, Mawatari Shunsuke F. Development and metamorphosis of the cyphonautes larva of Membranipora serrilamella Osburn. In: Documents des Laboratoires de GĂ©ologie de la FacultĂ© des Sciences de Lyon. Hors sĂ©rie n°3, 1975. Bryozoa 1974 â Proceedings of the third Conference International Bryozoology Association â Lyon (fasc. 1) pp. 13-18