Steromphala cineraria ( Linnaeus, 1758 )

Bouchard, Blanche, Wesselingh, Frank P., Pouwer, Ronald & Landau, Bernard, 2025, The Gelasian gastropod fauna of Selsoif (Manche, France), Geodiversitas 47 (3), pp. 39-91 : 48

publication ID	https://doi.org/10.5252/geodiversitas2025v47a3
publication LSID	urn:lsid:zoobank.org:pub:BE95BEFE-D4E3-4138-B9BE-5A5656BEA68F
DOI	https://doi.org/10.5281/zenodo.14850554
persistent identifier	https://treatment.plazi.org/id/8F310D3D-9557-FFBC-CDC3-FDEA82236878
treatment provided by	Plazi
scientific name	Steromphala cineraria ( Linnaeus, 1758 )
status

Treatment

Steromphala cineraria ( Linnaeus, 1758) View in CoL ( Fig. 4H View FIG 1-H View FIG 3 View FIG , I 1-I View FIG 3 View FIG )

Trochus cinerarius Linnaeus, 1758: 758 View in CoL .

? non Trochus cinerarius View in CoL – Wood 1848: 131, pl. 14, fig. 7.

Trochus (Gibbula) cinerarius – Harmer 1923: 731 (partim, not pl. 58, figs 25, 26) (Upper Pleistocene records only).

Gibbula cineraria View in CoL – Pouwer & Wesselingh 2012: 151, figs 1-3. — Alf et al. 2020: 70, pl. 50.

Steromphala cineraria View in CoL – Affenzeller et al. 2017: 804, fig. 5.

MATERIAL AND DIMENSIONS. — Maximum height 12.7 mm, width 12.4 mm. — RGM.1364902 (64), leg. WG ; RGM.1364968 (125), leg. ACJ ; RGM.1365177 (1), leg. ACJ ; RGM.1310831 (1), leg. ACJ ; RGM.1365066 (146), leg. AWJ .

SPECIES CHARACTERISATION. — Shell low trochiform; five weakly shouldered teleoconch whorls separated by narrowly impressed suture; sculpture of numerous, fine, irregular spiral cords; axial sculpture reduced to prosocline growth-lines; base depressed bearing numerous concentric cords; umbilicus well developed, moderately narrow and deep; columella short, straight, oblique; colour pattern of red-orange zigzag flammules preserved in all specimens.

DISTRIBUTION. — (Late Pliocene-Early Pleistocene: NSB and Irish Sea [ Wood 1848; Harmer 1923] likely based on misidentifications [ Pouwer & Wesselingh 2012]). Lower Pleistocene: Atlantic, Selsoif, France (this paper). Upper Pleistocene: British Isles (Harmer 1923). — Holocene: NSB ( Strand Petersen 2004).Today this species is predominantly found in cooler waters in the NSB and along the European Atlantic coasts North Norway, Iceland to Gibraltar ( Fretter & Graham 1977) and adjacent western Mediterranean ( Giannuzzi-Savelli et al. 1994). Records south of Gibraltar in the Atlantic and into the Mediterranean, such as southManousis (2021), need to be confirmed.

REMARKS

Based on molecular data, this species is now placed in the genus Steromphala Gray, 1847 ( Affenzeller et al. 2017). Most specimens from Selsoif are small and depressed ( Fig. 4I View FIG 1-I View FIG 3 View FIG ). One large, gerontic specimen ( Fig. 4H View FIG 1-H View FIG 3 View FIG ) is taller spired, with more strongly shouldered whorls, the shoulder marked by two slightly strengthened cords. In general, the Selsoif specimens have slightly more shouldered whorls than extant specimens, but we consider them conspecific.