Calliostoma Swainson 1840
- Dataset
- Mollusks (Gastropoda, Bivalvia) from Miocene cold-seep deposits in northern Italy: revisions and additions
- Rank
- GENUS
Classification
- kingdom
- Animalia
- phylum
- Mollusca
- class
- Gastropoda
- order
- Trochida
- family
- Calliostomatidae
- genus
- Calliostoma
description
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.
description
Fig. 4 D – F
discussion
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.
distribution
Stratigraphic and geographic range Middle Miocene (lower Serravallian), northern Italy.
materials_examined
Material examined ITALY – Tuscany • 1 spec.; Le Colline; MSF 1208 (W = 7.3 mm).