Cataegis taurocrassa

• Main Authors: Kiel, Steffen, Sami, Marco, Taviani, Marco
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2023
• Subjects: Biodiversity; Taxonomy; Animalia; Mollusca; Gastropoda; Seguenziida; Cataegidae; Cataegis; Cataegis taurocrassa; sami
• Online Access: https://doi.org/10.5281/zenodo.10380099; http://treatment.plazi.org/id/C80687AB9C2FFFC3FDDEFC6AFDEA6DB5

Cataegis taurocrassa (Sacco, 1895) Fig. 2A–J Phasianema costatum (Br.) var. taurocrassum Sacco, 1895: 18, pl. 1 fig. 37. Phasianema ( Phasianema ) taurocrassum – Moroni 1966: pl. 4 figs 2–3. Material examined ITALY – Emilia-Romagna • 2 specs; Ca’ Piantè; MSF 2352 (H = 4.8 mm), MSF 2353 (H = 7 mm). – Tuscany • 2 specs; Le Colline; MSF 1230 (H = 6.8 mm), MSF 2351 (W = 3.5 mm). Stratigraphic and geographic range Middle to Upper Miocene, northern Italy. Remarks This species was originally reported from the Calcari a Lucina deposits by Moroni (1966) as Phasianema taurocrassum , and was subsequently cited as such from other Calcari a Lucina sites in the Romagna Apennines (Sami & Taviani 2019; Kiel et al. 2023). Sacco (1895) introduced Phasianema costatum var. taurocrassum for rare specimens from the ‘Helvetian’ of Cinzano in the Turin hills (coll. Rovasenda). Ferrero Mortara et al. (1981) indicated that fossils from Cinzano locality are late Miocene in age. Moroni (1966) wrote that compared to the variants of the Aquitaine and Loire basins, and of the Italian Pliocene, Phasianema taurocrassum (elevated to species level by her) differs in size, by having a thicker shell, different proportion between the spiral cords and the interspaces, growth striae on the cords and interspaces, a the clearer umbilicus that is well delimited by the last spiral cord, a columellar callus with a straight margin that is oblique to the axis and parallel to the direction of the umbilical rim, a much narrower subsutural depression due to the twisted coil and therefore a less slender general shape. We follow her interpretation and consider the respective specimens from the Calcari a Lucina deposits as conspecific with Phasianema taurocrassum . The genus Phasianema Wood, 1842, however, is a pyramidellid (van Aartsen et al. 1998), based on the Pliocene fossil Phasianema sulcata Wood, 1842, as indicated by van Regteren Altena (1956). We find it questionable that a thick-shelled species like Phasianema taurocrassum should belong to the ...