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PubMed1979

Studies on the alimentary canal of amphipods: histochemistry of cephalic mucous glands in Talorchestia martensii (Weber) (Crustacea: Amphipoda).

With a view to analyse the chemical nature and the probable functional significance of the cephalic mucous glands the mucosubstances secreted and elaborated by these glands were investigated. All recent and standard histochemical techniques were employed. These reactions revealed that the three groups of glands namely the oesophageal, lateral and maxillipede groups are charged with the task of secreting both acid and neutral mucopolysaccharides. Of these three, maxillipede groups are elaborating most of the neutral mucopolysaccharides and the other two groups are mainly involved in elaborating acid mucosubstances and to a little extent neutral mucosubstances. The acidic nature of the mucosubstances is partly due to hyaluronic acid and partly due to sialic acid. This was confirmed by hyaluronidase and neuraminidase treatment (digestion tests). The glands are also involved in secreting glycoproteins which was evidenced by their positivity to alcian blue/naphthol yellow and Congo red reactions. Entanglement of food and provision of fluid vehicle for lubrication as well as to achieve the desired consistency for digestion may be given as chief functions.

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PubMedDate not supplied

[Ultrastructural study of Palavascia sphaeromae (Trichomycetes Eccrinales) parasite of the proctodeum of Sphaeroma serratum (Crustacea Isopoda) (author's transl)].

All stages of development of Palavascia sphaeromae parasite of the proctodeum of Sphaeroma serratum, are studied for the first time under the electron microscope. The formation of the holdfast, cell walls and septa is followed. In the coiled apex of the mature thalli, the septa form two catogeries of unisporates sporangia leading to two types of spores. Type 1, a multinucleate spore giving birth in situ to several microthalli. Type 2, a uninucleate at first and then quadrinucleate spore, representing the only propagative elements of the species. This study proves that the Palavasciae are well integrated among the Eccrinales order. It also opens a new discussion concerning the phyletic affinities that can exist between the Eccrinales and the other three orders of Trichomycetes.

Animals↗