| one publication added to basket [12545] | Recherches sur la morphologie et étude histochimique de la tunique d'Halocynthia papoillosa Gun. (ascidie stolidobranche)
Stievenart, J. (1971). Recherches sur la morphologie et étude histochimique de la tunique d'Halocynthia papoillosa Gun. (ascidie stolidobranche). Ann. Soc. R. Zool. Bel. 101(1-2): 25-56
In: Annales de la Société Royale Zoologique de Belgique = Annalen van de Koninklijke Belgische Vereniging voor Dierkunde. Société Royale Zoologique de Belgique: Bruxelles. ISSN 0771-5528, more
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| Keywords |
Halocynthia papillosa (Linnaeus, 1767) [WoRMS]
Marine/Coastal |
| Abstract |
Investigations on the test of a stolidobranch ascidian, H. Papillosa, have revealed the presence of 2 sharply distinct regions in the tunic: a hard and rather thin outer layer, the cuticle, composed of a mosaic of plates, more or less rounded and adorned with spines, and a thick, fibrous and obviously organised inner layer, the fundamental substance. Different types of cells are widespread in this layer. Association of histochemical methods, progressive extractions and nitrogen estimations allowed detection and localization of 3 main components in the tunic: acidic mucopolysaccharides, neutral polysaccharides (cellulose) and proteins. Proteins (scleroproteins?) are especially concentrated in the cuticle while bundles of the fundamental substance are built up with cellulose fibres embedded by amorphous mucopolysaccharides. The tunic of H. Papillosa is compared with the tests of the 2 phlebobranch ascidians, Ascidiella aspersa and Phallusia mammillata. |
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