A comparative analysis of the evolution of the egg envelopes and the origin of the yolk
作者:
Massimo Mazzini,
Giuliano Callaini,
Caterina Mencarelli,
期刊:
Bolletino di zoologia
(Taylor Available online 1984)
卷期:
Volume 51,
issue 1-2
页码: 35-101
ISSN:0373-4137
年代: 1984
DOI:10.1080/11250008409439457
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
In this paper, the evolution of egg envelope is examined from a structural point of view. The structurally simplest eggs are found in Sponges and Cnidarians where reproduction is ensured by external fertilization. In these instances, the oocyte plasma membrane is protected by only a thin glycocalyx. A more structurally complex envelope is present in triblastic Metazoa where the vitelline membrane makes its first appearance.
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