Boury-Esnault, N. (1972). Une structure inhalante remarquable des Spongiaires: le crible. Etude morphologique et cytologique. Archives de Zoologie expérimentale & générale. 113 (1): 7-23.

472509

Boury-Esnault, N.

1972

113 (1): 7-23

Publication

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The inhalant orifices of the sponges aquiferous system can in some species, joïn up and make stable inhalant structures. The study, in 6 species, of the sieve, example of such a structure, shows that it is an ectosomic differentiation produced by a modification of the cellular topography relating not only to the superficial inhalant area but also the underlying cavity. The inhalant sieved lamina shows an organisation in three characteristic zones: an upper zone is essentially constituted by an exopinacocyte layer, a middle zone with contractile spindle-shaped cells forming sphincter, an inner zone is involvjng archeocytes, globiferous cells, vacuoles-cells and limited by prosopinacocytes. The wall of the vestibule is made interlocking of the sieved lamina by a sphincter which is in continuily with the one of the lamina. A spicule-stratum limits the whole which is perfectly individualised in the ectosome. The "inhalant organ" so defined tends to a better control of the water-current.

Histology, Cytology

Porifera

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