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Ultrastructural study of the mature egg of the marine sponge Stelletta grubii (porifera demospongiae)

✍ Scribed by Margherita Sciscioli; Lidia Scalera Liaci; Elene Lepore; Miriam Gherardi; Tracy L. Simpson


Book ID
111662224
Publisher
John Wiley and Sons
Year
1991
Tongue
English
Weight
944 KB
Volume
28
Category
Article
ISSN
1040-452X

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First evidence of chitin as a component
✍ Hermann Ehrlich; Manuel Maldonado; Klaus-dieter Spindler; Carsten Eckert; Thomas πŸ“‚ Article πŸ“… 2007 πŸ› John Wiley and Sons 🌐 English βš– 365 KB

## Abstract The Porifera (sponges) are often regarded as the oldest, extant metazoan phylum, also bearing the ancestral stage for most features occurring in higher animals. The absence of chitin in sponges, except for the wall of peculiar resistance bodies produced by a highly derived fresh‐water g