Retiskenea, Waren & Bouchet, 2001

Kiel, Steffen, Sami, Marco & Taviani, Marco, 2023, Mollusks (Gastropoda, Bivalvia) from Miocene cold-seep deposits in northern Italy: revisions and additions, European Journal of Taxonomy 910, pp. 115-160 : 129

Retiskenea ? sp.

Fig. 5O–Q

Material examined

ITALY – Tuscany • 2 specs; Ca’ Cavalmagra ; MSF 1312 , MSF 2364 .

Description

Low, turbiniform, smooth shell with about 2.5 whorls, about 3 mm across; whorls nearly circular in cross section, suture deep, slight bulge near upper suture.

Remarks

The two available specimens are embedded in rock matrix and are rather poorly preserved. They have the size and habitus of specimens belonging to the neomphaline Retiskenea (e.g., Warén & Bouchet 2001; Kiel 2006; Campbell et al. 2008; Kaim et al. 2014; Kaim 2022), but do not preserve details of the protoconch, which would be needed for a reliable assignment to the neomphalids. The specimens are quite similar to a ‘skeneimorph gastropod’ reported by us from the Late Miocene Ca’ Fornace seep deposit (Kiel et al. 2018).

Stratigraphic and geographic range

Middle Miocene (upper Langhian), northern Italy.

Figures

Fig. 5. Vetigastropoda Salvini-Plawen, 1980, Patellogastropoda Lindberg, 1986 and Neomphalina McLean, 1981 from the Calcari a Lucina seep deposits in northern Italy. A–G. The colloniid (Vetigastropoda) Homalopoma domeniconii Moroni, 1966. A–B. MSF 2357 from Ca’ Piantè. C–D. MSF 2365 from Ca’ Piantè. E–G. MSF 1216 from Le Colline.H–L. The fissurellid (Vetigastropoda) Fissurella costicillatissima Sacco, 1897, from Le Colline. H–I. Specimen with remnants of surface sculpture (MSF 1214). J–L. Internal mold showing mantle attachment scars and foramen (MSF 1213). M–N. The lottiid (Patellogastropoda) Tectura? cf. taurinensis Sacco, 1897, from Ca’ Cavalmagra (MSF 1310). O–Q. The neomphaline Retiskenea? sp. from Ca’ Cavalmagra. O–P. MSF 2364. Q. MSF 1312.