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

ISBN-10: 2856535801

ISBN-13: 9782856535806

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27. Morphologie des méduses. A-F, Détail des structures marginales : A, partie du bord marginal exombrellaire de Eutima coerulea (Leptomedusae) montrant un statocyste clos, des protubérances ou verrues marginales et des cirres latéraux ; B, portion du bord exombrellaire de Cosmetira pilosella (Leptomedusae) montrant les cirres spiralés flexibles ; C, bord marginal exombrellaire de la Narcomedusae Pegantha rubiginosa montrant les lobes marginaux, les péronies et les otoporpes ; D, statocyste marginal ouvert et des cirres marginaux de Mitrocomella brownei, Leptomedusae ; E, partie du bord marginal exombrellaire d’Orchistoma pileus (Leptomedusae) montrant les structures tentaculiformes ; F, détail d’un statocyste ouvert de Mitrocoma (Leptomedusae).

28. Histology of the medusae, diagrammatic, optical, longitudinal section of a medusa of Cladonema radiatum, Anthomedusae. Perradial section (left side), interradial section (right side), (after Bouillon & Houvenhagel, 1970). AU = cnidocysts or nettle ring; B = mouth; CC = circular canal; CG = gastric cavity; CGlSpO = endodermal spumous oral gland cell; CglSphO = endodermal spherulous oral gland cell; CGlSphSt = endodermal stomacal spherulous gland cell; CR = radial canal; CT = tentacular canal; End = endoderm; Ex = exumbrella; LC = endodermal lamella or cathamnale lamella; M = mesoglea; Man = manubrium; O = oral tentacle; SO = subumbrella; T = male “gonad”; TA = adhesive tentacle; TN = stinging part of tentacle; V = velum;Y = ocelli.

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.

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An introduction to Hydrozoa by Jean Bouillon, Cinzia Gravili, Francesc Pagès, Josep-Maria Gili, Ferdinando Boero

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