An ultrastructural comparative study of the eggs of two species ofTethya(Porifera, Demospongiae)
作者:
ELDA GAINO,
MICHELE SARÀ,
期刊:
Invertebrate Reproduction & Development
(Taylor Available online 1994)
卷期:
Volume 26,
issue 2
页码: 99-106
ISSN:0792-4259
年代: 1994
DOI:10.1080/07924259.1994.9672406
出版商: Taylor & Francis Group
关键词: Gametes;cytoplasmic inclusions;multilayered cell membrane;sponges
数据来源: Taylor
摘要:
The organization of the eggs ofTethya tenuiscleraandTethya seychellensis(Porifera, Demospongiae), collected inside the lagoons of two Maldive Islands, was studied by SEM and TEM. The cytoplasmic matrix is vacuolated and filled with stored material. Phagosome-like and rod-like inclusions represent the major components. Phagosome-like inclusions correspond to the egg yolk; rod-like inclusions undergo modifications resulting in filament bundles that accumulate underneath the cell membrane. The occurrence of undigested bacteria in membrane-bound vacuoles within the cytoplasmic matrix suggests a maternal transmission of symbionts. InT. seychellensisthe layered appearance of the cell surface results from the accumulation of membranes associated with cytoplasmic vacuoles. This structure constitutes an envelope along the egg peripheral border and is interpreted as a protecting sheath improving egg survival after spawning.
点击下载:
PDF (3150KB)
返 回