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By Jean Bouillon, Cinzia Gravili, Francesc Pagès, Josep-Maria Gili, Ferdinando Boero

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A-B, vue latérale du manubrium : A, Sarsia ; B, Dipurena. C-D, coupe transversale du manubrium : C, Bougainvillia muscus ; D, B. principis. E-H, types de « gonades » sur les canaux radiaires : E, ovale ; F, lineaire ; G, plissée ; H, sinueuse. I-J, coupes transversales de « gonades » sur les canaux radiaires : I, Clytia ; J, Tiaropsis. K-L, vues latérale de « gonades » : K, Craspedacusta ; L, Aglantha (d’après Russell, 1953). M-U = Diagramme des tentacules marginaux chez différentes méduses : M = Leuckartiara octona (Anthomedusae) ; N = Sarsia tubulosa (Anthomedusae) ; O = Corymorpha nutans (Anthomedusae) ; P = Cosmetira pilosella (Leptomedusae) ; Q = Gossea corynetes (Limnomedusae) ; R = Hybocodon prolifer (Anthomedusae) ; S = Bougainvillia britannica (Anthomedusae) ; T = Clytia hemispherica (Leptomedusae) ; U = Proboscidactyla stellata (Anthomedusae) (d’après Russell, 1953).

Gravili, F. -M. Gili & F. Boero tentacles The tentacles are generally inserted on the umbrellar rim, but in the Narcomedusae, for instance, they are on the latero-dorsal exumbrellar face. The ectoderm of tentacles is formed by very flattened epithelio-muscular cells, and provided with longitudinal smooth muscular fibers, whose contraction leads to tentacle shortening. Solid tentacles are devoid of digestive or excretory inclusions, they present a «chordal» aspect, and they elongate by contraction of their smooth circular musculature.

I. = tissu ingéré. in digestion. Those cells, called ectodermal hypostomial mucous gland cells, (present in: Dipurena, Cladonema, Eleutheria, Staurocladia) have not to be confused with normal epidermal cells thickenings. Some Sertulariidae and the Thyroscyphidae have a thin layer of ectoderm lining the interior of the hydrothecae: the mantle, or ectodermal supporting lamella or “haftlamella”. The mantle is usually issued from the base of the hydranth and may completely wrap around withdrawn hydranths when forming a roofing plate.

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