Mollusks (Gastropoda, Bivalvia) from Miocene cold-seep deposits in northern Italy: revisions and additions Author Kiel, Steffen 2BC780D7-8596-4A88-B679-43D4DF7D7E62 Swedish Museum of Natural History, Department of Palaeobiology, Box 50007, 10405 Stockholm, Sweden. steffen.kiel@nrm.se Author Sami, Marco 84B3092F-9552-4BA5-9D8A-6B0D4EB9C18F Museo Civico di Scienze Naturali, 51, Via Medaglie D’Oro 51, 48018 Faenza, Italy. marco.sami@cheapnet.it Author Taviani, Marco 693853C3-940F-43BE-AE69-6344CD02A001 Institute of Marine Sciences, Italian National Research Council, Via Gobetti 101, 40129 Bologna, Italy; and Stazione Zoologica Anton Dohrn, Villa Comunale, 80121 Napoli, Italy. marco.taviani@bo.ismar.cnr.it text European Journal of Taxonomy 2023 2023-12-11 910 115 160 https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2365/10359 journal article 10.5852/ejt.2023.910.2365 2118-9773 10350702 DED6151F-FD3A-488D-9CAF-1B0DAD697BA3 Calliostoma ? sp. Fig. 4D–F Material examined ITALY – Tuscany • 1 spec. ; Le Colline ; MSF 1208 (W = 7.3 mm ) . Description Dome-shaped shell, ca 6 mm high, whorls with slightly convex flanks and indistinct suture, sculpture cancellate with 10 spirals on last whorl, crossed by equally sized and spaced, oblique and sinuous axial ribs. Remarks The cancellate sculpture and dome-shaped spire of this species are somewhat unusual for Calliostoma , but the specimen is within the morphological range of other Calliostoma species ( Quinn 1992 ; Dornellas & Simone 2013 ). Shells with similar sculpture and a general dome-like habitus, though with much broader spire, are built by members of the genus Ancistrobasis Dall, 1889 (i.e., Ortega & Gofas 2019 ; Gofas et al. 2021 ). The shell resembles certain species of Jujubinus Monterosato, 1884 , for example Jujubinus cf. proximus (Millet, 1865) and Jujubinus sceauxensis Landau, Van Dingenen & Ceulemans, 2017 , from the Loire Basin in northwestern France ( Landau et al. 2017 : pls 23, 25). But Jujubinus inhabits intertidal to shallow submarine habitats ( Rueda et al. 2008 ; Reich et al. 2014 ) and is unlikely to be found in a deep-marine seep environment. Similar sculpture and shell shapes can also be seen in members of the trochoid genus Odontotrochus Fisher, 1879 , for example the extant species Odontotrochus suni Huang & Fu, 2022 and O. poppei (Lan, 1991) from North Australia ( Huang & Fu 2022 ). The Late Miocene Phorculellus taurangulosus Sacco, 1896 from the Turin hills ( Ferrero Mortara et al. 1984 : pl. 48 fig. 1) has similar sculpture but less straight-sided whorls than Calliostoma ? sp. Stratigraphic and geographic range Middle Miocene (lower Serravallian), northern Italy .