Calliostoma undetermined

• Main Authors: Kiel, Steffen, Sami, Marco, Taviani, Marco
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2023
• Subjects: Biodiversity; Taxonomy; Animalia; Mollusca; Gastropoda; Trochida; Calliostomatidae; Calliostoma; Calliostoma undetermined; sami
• Online Access: https://doi.org/10.5281/zenodo.10380136; http://treatment.plazi.org/id/C80687AB9C22FFCCFD25FD62FC876816

Calliostoma sp. Fig. 4A–C Material examined ITALY – Tuscany • 1 spec.; Le Colline; MSF 1207 (H = 10 mm). Description Conical shell, about 10 mm high, at least seven straight-sided whorls beaded spiral cords at upper and lower suture, smooth in between; basal margin sharp, base smooth, almost flat; aperture subcircular, entire. Remarks Sacco (1896) illustrated various species of Calliostoma (as Ampullotrochus ) from Miocene and Pliocene strata of northern Italy. Similar regarding the nodular subsutural cords are Ampullotrochus cinculatus (Verrill, 1884) (Sacco 1896: 45, pl. 4 fig. 46) and A. granulatus Born, 1778 (Sacco 1896: 42–43, pl. 4 figs 34–37). The latter species has, as the name indicates, a more granular sculpture (see Gardella & Tabanelli 2017: figs 3–4). A similar fossil Calliostoma with smooth whorl flanks but less distinct subsutural nodular cords is Calliostoma margarita Lozano-Francisco & Vera-Peláez, 2002 from the Pliocene of southern Spain and northern Italy (Lozano-Francisco & Vera-Peláez 2002; Gardella & Tabanelli 2017). Similarly high-spired but with more distinct spiral ornament is the Pliocene Ampullotrochus perstriolatus Sacco, re-illustrated by Ferrero Mortara et al. (1984: pl. 49 fig. 5). Stratigraphic and geographic range Middle Miocene (lower Serravallian), northern Italy. Published as part of Kiel, Steffen, Sami, Marco & Taviani, Marco, 2023, Mollusks (Gastropoda, Bivalvia) from Miocene cold-seep deposits in northern Italy: revisions and additions, pp. 115-160 in European Journal of Taxonomy 910 on page 124, DOI:10.5852/ejt.2023.910.2365, http://zenodo.org/record/10350702