Rolan e (203 Ergebnisse)

Rustica (tapa blanda). Zustand: New. Zustand des Schutzumschlags: Nuevo. 01. Este volumen ofrece la primera edición crítica, en bilingüe y atendiendo a todos los testimonios. manuscritos latinos y romances, de la primera parte. del Breuiloquium de amore et amicitia y su autotraducción, Tratado de amor y amiçiçia, titulada. De am…

The species of the genus Assiminea from the occidental African coast are studied, and comparisons with those previously known are presented. In the absence of definitive proof. it is assumed that Assiminea hessei O. Boettger, 1887 is applicable to the Angolan populations. Five new species are described. New taxa: Assiminea princ…

Three new species of the genus Alvania collected in Sao Tomé Island are described. The new species are compared with others of similar morphology from the African coast. Some characters, usually considered typical of the genus Manzonia are commented on; these appear in some species here included in the genus Alvania. The latter…

Zospeum percostulatum sp. n. from Cueva de La Herrería (Llanes, Asturias) is described. It is characterized by a relatively large shell (1.41.8 mm height), conical, with ovate aperture, continuous peristome and thickened parietal callus; shell costulate except two first whorls; without any sort of inner formations. It is the fir…

The genetic structure of two sibling and sympatric species of the genus Littorina was compared using allozymic loci. The two species are biologically and ecologically well-known and mostly show similar life history characteristics. Three populations of Littorina mariae Sacchi & Rastelli and Littorina obstusata (L.) were studied…

Galician exposed shore populations of the direct developing periwinkle Littorina saxatilis are strikingly polymorphic, with an ornamented and banded upper shore form and a smooth and unbanded lower shore form. Intermediates between the two pure forms occur in a narrow mid shore zone together with the parental forms. We have prev…