Étude histologique du développement embryonnaire de quelques hydroméduses de Roscoff: Phialidium hemisphaericum (L.), Obelia sp. Péron et Lesueur, Sarsia eximia (Allman), Podocoryne carnea (Sars), Gonionemus vertens Agassiz
Bodo, F.; Bouillon, J. (1968). Étude histologique du développement embryonnaire de quelques hydroméduses de Roscoff: Phialidium hemisphaericum (L.), Obelia sp. Péron et Lesueur, Sarsia eximia (Allman), Podocoryne carnea (Sars), Gonionemus vertens Agassiz. Cah. Biol. Mar. 9(1): 69-104
In: Cahiers de Biologie Marine. Station Biologique de Roscoff: Paris. ISSN 0007-9723; e-ISSN 2262-3094
The development of five Hydromedusae belonging to four different groups was studied. The eggs are laid and fecunded in the free water. They divide following the total radiar and subregular pattern, giving rise to blastula (coeloblastula or sterroblastula). The didermic structure is accomplished after gastrulation which is either the unipolar migration, the delamination or the cellular rearrangement by infiltration. The differentiation of the planula is variable following always the well-known general pattern. The histology of the planulae is discussed, giving particular attention to the cnidogenesis and the structure of the gland cells.
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