1,721,308 research outputs found
Notulae Malacologicae VIII. Una nuova specie appenninica di Belgrandia e nuove considerazioni sui rapporti sistematici tra i generi Belgrandia e Sadleriana (Gastropoda: Prosobranchia)
No full textNotulae Malacologicae, XXIV. Il genere Mercuria (Prosobranchia: Hydrobioidea) nell'Isola di Sardegna. (Studi sulla malacofauna di Sardegna e Corsica, IV)
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Notulae Malacologicae, XXX. I molluschi viventi, terrestri e d'acqua dolce, nello studio biogeografico dell'isola di Sardegna
No full textUn nuovo Hygromiidae dell'Appennino centro-meridionale e note sul genere Cernuella e sui taxa correlati (Gastropoda: Helicoidea)
No full textThe status and relationships of Vitrina polloneriana Fra Piero, 1897, with description of Sardovitrina n. gen. (Gastropoda: Pulmonata: Vitrinidae)
No full textVitrina polloneriana Fra' Piero, 1897, is revised and assigned to the new monospecific genus: Sardovitrina. The new genus belongs to the plutonmine vitrimids (vitrinids with glandula amatoria) and is close to Oligolimax Fischer in Paulucci, 1878 (Oligolimax and Sardovitrina share a penial retractor passing above the right ommatophore retractor). However, all species included in Oligolimax are distinct from Sardovitrina by the fact that they can withdraw their body entirely into the shell, and by virtue of small shell lobes and completely different internal structures of the penial complex
L'azione della Myticola intestinalis Steuer, sul Mytilus galloprovincialis Lam. del litorale toscano.
No full textThe spermatozoon of Truncatella (s.str.) subcylindrica (L.) (Gastropoda Prosobranchia)
No full textThe spermiogenesis of Truncatella (s. str.) subcylindrica (L.) (Prosobranchia, Truncatellidae) has been studied with the electron microscope. The different parts of the spermatozoon are arranged in a normal sequence but they have nevertheless, certain peculiarities which deserve attention: The nucleus is almost entirely helical; two concentric rings of microtubules are contained within the walls of the acrosomal cone the inner one reaching only half way up the cone. The «coarse fibres» present in the terminal segment of the axoneme of other kinds of Prosobranchs are not present here. Through the study of the several phases of the spermiogenesis it has been ascertained that the acrosomal cone and the acrosomal rod derive from the Golgi complex and that the classical centriole disappears after the very first phases of the spermatid’s maturation
Notulae Malacologicae, XXXI. Nuove Hydrobiidae dell'Italia nord-occidentale (Gastropoda: Prosobranchia)
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