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Sexual dimorphism in a scarcely dimorphic newt, Triturus italicus (Peracca, 1898) (Caudata: Salamandridae)
No full textThe phylogenetic relationships of Triturus italicus
No full textSeveral studies attempted to reconstruct the phylogenetic relationships
among the species of Tritums by a number of data sets
from morphology, courtship behaviour, reproductive interactions,
cytogenetics and molecules. The present paper critically reviews
those studies with regard to the phylogenetic affinities of T. italicus
(Peracca, 1898). Most studies locate T. italicus within the radiation
of the small-sized newts (subgenus Palaeotriton), but are in conflict
about its sister-group, whether T. vulgaris or T. boscai. Recent studies
on mtDNA sequences suggest that Triturus is paraphyletic and
several other genera should be included within the genus, with T.
italicus being an outgroup of all the other species and genera. It is
concluded that, at present, little can be stated about the relationship
of T. italicus and that new data should be collected
Genetic distances between the populations of Cyrtodactylus kotschyi (Squamata: Gekkonidae) from Apulia and Greece
No full textConfronto tra le popolazioni pugliesi e greche del geco Cyrtodactylus kotschyi (Reptilia: Squamata: Gekkonidae)
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Comparative glycopattern analysis of mucins in the Brunner's glands of the guinea-pig and the house mouse (Rodentia)
No full textThe mucins secreted by the Brunner's glands and the duodenal goblet cells of the Guinea-pig and the house mouse were compared by conventional and FITC-conjugated lectin histochemistry. Methylation/saponification and sialidase digestion were performed prior to lectin binding to detect the residues subterminal to sulfated groups and sialic acid, respectively. In the Guinea-pig the Brunner's glands produce class-III stable sulfosialomucins. Sialic acid is mostly 2,6-linked to galactose or to N-acetylgalactosamine and is in part O-acetylated in C7, C8, and C9. Sulfated groups are probably linked to sialic acid and N-acetylgalactosamine. Terminal residuals of N-acetylglucosamine, galactose, N-acetylgalactosamine and fucose linked in alpha1,2, alpha1,3, and alpha1,4 are also present. Duodenal goblet cells of the Guinea-pig present a lower number of residuals in respect to the Brunner's glandular ones, with sialic acid and N-acetylgalactosamine subterminal to sulfated groups. In the house mouse the Brunner's glands produce class-III stable neutral mucins, binding to same lectins as in the Guinea-pig except for those specific to sialic acid. A diversity of fucosylated residuals higher than in the Guinea-pig is observed. The mouse duodenal goblet cells lack stable class-III mucins, have little sialic acid and present a lower number of residuals in respect to the correspondent Brunner's glands. Regulation of the acidic intestinal microenvironment, prevention of pathologies and hosting of microflora can explain the observed results and the differences observed between the two rodents
Variazioni morfologiche delle cellule ossinticopeptiche nello stomaco della lucertola campestre Podarcis sicula campestris De Betta, 1857
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Genetic divergence between two insular species of the genus Rhithrogena (Ephemeroptera, Heptageniidae)
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