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A large clavatulid species first reported from the Early Pliocene of Italy (Gastropoda, Neogastropoda, Conoidea)
No full textShells of a species of Perrona, a genus never reported before from the Pliocene of Italy, were collected in the Early Pliocene of southern Tuscany over the last twenty years. These shells recall those of P. villarrasensis Vera-Peláez & Lozano-Francisco 2001, from the Early Pliocene of southern Spain, by virtue of shape, size and development of parietal callus. However the poor condition of available material and the lack of a reliable taxonomic framework for this group of Euro-Mediterranean fossil clavatulids make it difficult to propose a realistic determination. The finding of a species of Perrona in the Pliocene of Italy is very interesting. During the Miocene species of Perrona were common and widespread in the Euro-Mediterranean area, but in the Early Pliocene only four species survived in southern Spain and records from the eastern Mediterranean are limited to one from Tunisia and the present from southern Tuscany
Megascyliorhinus miocaenicus (Chondrichthyes, Galeomorphii) from the Zanclean (early Pliocene) of San Quirico d'Orcia, central Italy
No full textTwo almost complete teeth, one anterior and one lateral, of the extinct shark Megascyliorhinus miocaenicus (Antunes & Jonet, 1970) are reported from the early Pliocene of San Quirico d'Orcia, Tuscany, central Italy. The teeth are similar in size and morphology (vertical striations of the crown base, indistinct cutting edge of the crown and accessory cusplets) to conspecific teeth described in literature. This is the first unequivocal report of a rare and enigmatic shark in the Pliocene of central Italy. A Pliocene tooth from Allerona, Umbria, central Italy, formerly assigned to Scyliorhinus sp., may also belong to Megascyliorhinus miocaenicus
I molluschi marini pliocenici dei dintorni di Siena negli scritti di Carlo De Stefani e Dante Pantanelli.
No full textOnustus plioextensus (Sacco, 1896) (Gastropoda: Caenogastropoda): a Mediterranean Pliocene xenophorid with western Atlantic relationships?
No full textOnustus plioextensus (Sacco 1896) is a Mediterranean Pliocene xenophorid characterized by a large fragile shell with wide thin peripheral flange, porcellanous below. It is only known from the Piacenzian (Middle Pliocene) of central northern Italy and is very similar to the west Atlantic Onustus longleyi (Bartsch 1931). If the morphological similarity between these two xenophorids is not a result of convergent evolution and testifies to real affinity, then they constitute a group of closely related species with amphi-Atlantic distribution, a biogeographical pattern suggested for certain gastropod species mainly belonging to the tonnoideans
Mediterranean Neogene Sthenorytis: taxonomic and nomenclatural status of Brocchi's (1814) Turbo retusus and Turbo trochiformis (Gastropoda Epitoniidae)
No full textThe taxonomic and nomenclatural status of the two earliest established Mediterranean Sthenorytis species: Turbo retusus Brocchi 1814 and Turbo trochiformis Brocchi 1814, was re-examined. The identity of Turbo retusus remains uncertain because there are no specimens with certain type status or topotypes on which to designate a neotype. In fact, we agree with de Boury (1890) that Brocchi had no specimens of this species and that he described it on the basis of Monti's (1746) figure, the specimen of which has been lost. The identity of Turbo trochiformis was clarified, designating the only existing historical topotype as neotype
The xenophorids of the Pliocene Basin of Siena (Gastropoda, Caenogastropoda, Xenophoridae)
No full textThe systematics of fossil Eura-Mediterranean xenophorids is still relatively unknown, due to the many problems involved in studying them (very conservative shell structure, few available shell characters, the fact that the attached objects modify whorl shape and vary in amount, the rarity of certain species and the difficulty of finding well preserved specimens). Most of the relevant literature dates back to the classic monographs on Tertiary molluscs by M. Hörnes, F. Sacco and M. Cossmann. Seven species have been reported from the Euro-Mediterranean Pliocene: Xenophora crispa (König, 1825), X. deshayesi (Michelotti, 1847), X. infundibulum (Brocchi, 1814), X. plioitalica Sacco, 1896, X. scaldensis Glibert, 1958, Stellaria plioextensa (Sacco, 1896), and S. testigera (Bronn, 1831). However, all but three (X. crispa, X. infundibulum, and S. testigera) are practically unknown. This paper is devoted to six species found in the Siena Pliocene Basin, a classic Italian Pliocene area. Five of them (X. crispa, X. infundibulum, X. plioitalica, S. plioextensa, and S. testigera) are redescribed and current knowledge about them summarized; the sixth species, known from a dozen specimens, is described as new: X. davolii n. sp. In the remarks to the new species, the status and the relationships of some classical Euro-Mediterranean Tertiary xenophorid species, i.e. X. deshayesi (Michelotti, 1847), X. burdigalensis (Grateloup, 1847) and X. grateloupi (D'Orbigny, 1852), are discussed. A neotype is designated for two species (X. crispa and S. testigera) and a proposal of neotype designation is made for some Miocene species: X. deshayesi, X. burdigalensis, and X. grateloupi
The lost Aporrhais species from the Italian Pliocene: A. peralata (Sacco, 1893) (Gastropoda, Caenogastropoda)
No full textThree Early - Middle Italian Pliocene aporrhaid species are redescribed on the basis of material from the Siena and Radicofani basins (central Italy). Two of them, Aporrhais pespelecani (Linnaeus, 1758) and Aporrhais uttingeriana (Risso, 1826), are well known but the third, Aporrhais peralata (Sacco, 1893), has been almost completely overlooked despite its probable widespread distribution in the Italian Pliocene. This species, characterized by peristome with large parietal callus, long adapical digitation, thick laminar abaxial lip with three short digitations and short abapical digitation, is distinct from other Euromediterranean Pliocene to Recent species. However problems remain with specimens of Aporrhais serresiana (Michaud, 1828) having a wider lip and shorter digitations. The latter were formerly assigned to a different species, Aporrhais macandreae Jeffreys, 1867, but are now considered conspecific with A. serresiana, though re-analysis of their taxonomic status by modern approaches would be useful. A. peralata is distinct from these specimens by virtue of its more delicate axial sculpture, more obtuse spire and larger abaxial lip with shorter digitations
On the nomenclatural status of Nassa elabrata Doderlein, 1864 (Mollusca, Gastropoda, Nassariidae)
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