By Jean Bouillon, Cinzia Gravili, Francesc Pagès, Josep-Maria Gili, Ferdinando Boero
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Extra resources for An introduction to Hydrozoa
13. Histologie des hydroïdes, illustrations de sections histologiques longitudinales de différentes parties d’un hydranthe d’Anthomedusae. A, section de la région hypostomiale, Staurocladia portmanni. B, section d’une portion de la colonne gastrique, Cladocoryne floccosa. C, section d’une portion du stolon, Dipurena halterata (Bouillon, figures originales). D. = inclusion digestive ; I. Ex. = inclusion excrétrice ; M. Ect. End. = muscle endodermique circulaire ; Nem. = cnidoblaste ; P. = périderme ; Ps.
TEM reveals a felting of thin feebly oriented fibers devoid of periodic structure and associated with rather uniform and dense granulations. The histological and histochemical tests applied to this mesoglean layer suggest an elastic and collagenic nature. The hydroid mesoglea has several roles: it acts as skeleton, as way of migration for interstitial cells and cnidoblasts, as shifting layer for the two epithelia and, in freshwater polyps, as osmotic regulator. Medusae Morphology of the medusae (Figs 24-27) the bell Hydrozoan medusae present essentially a tetramerous radial symmetry.
51 52 Jean Bouillon, C. Gravili, F. -M. Gili & F.