Lévi, C. (1970). Les cellules des éponges. In: Fry WG (ed) The Biology of the Porifera. Symposium of the Zoological Society of London, Academic Press London. 25, 353-364.

277316

Lévi, C.

1970

25, 353-364

Publication

Proceedings of the 1st international Sponge Conference

Available for editors   [request]

Studies on the structure and morphogenesis of Porifera demonstrate clearly that the simultaneous presence of choanocytes and pinacocytes is a characteristic attribute of the group. Ohoanocytes and pinacocytes form, respectively, a choanoderm and a pinaco- derm; the former controls the nutrition of the sponge, while the latter' controls the interrelations between the mesohyl and the external medium. Second, increasing thickness of the mesenchyme induces an early differentiation of the internal collencytes. Pinacocytes and collencytes are apt to differentiate to ultimate states such as porocytes, contractile cells, etc. In this way they perform vital homeostatic functions and at times they may assume the role of phagocytes. Study of sponge cells suggests that the three following properties-differentiation of a ciliary apparatus, ability to phagocytose and synthesis of the precursors of inter- cellular proteins-are characteristic of the primary cell types and are not specific signs of an ultimate state of functional differentiation.

Histology, Cytology

Porifera

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