Fig. 5A–G
Homalopoma (Homalopoma) domeniconii Moroni, 1966: 72, pl. 2 figs 1, 4–6.
ITALY – Emilia-Romagna • 1 spec.; Ca’ Cassano; MSF 2356 • 2 specs; Ca’ Piantè; MSF 2357 (W = 9.7 mm), MSF 2365 (W = 8.8 mm). – Tuscany • 5 specs; Le Colline; MSF 1216 (W = 8 mm), MSF 1217 (W = 9 mm), MSF 2354 (W = 6.3 mm), MSF 2355 [2 specs] • 2 specs; same collection data as for preceding; NRM Mo 204844 (2 specs).
We believe Moroni (1966) correctly assigned this species to Homalopoma. Initially reported from outcrops at Santa Sofia (Moroni 1966; Taviani 1994, 1996), it has since been reported from other Calcari a Lucina sites only rarely (Sami & Taviani 2019; Kiel et al. 2023). Homalopoma sp. reported by Gill et al. (2005) from the Eocene to Miocene seep deposits of Barbados has more numerous spiral cords per whorl than H. domeniconii. Several species of Homalopoma have been reported from the Eocene Humptulips Formation in western Washington State, USA, associated with methane-seep deposits and wood-falls (Goedert & Squires 1990; Saul et al. 1996; Kiel 2008), all of which are much taller than H. domeniconii. Species of Homalopoma have also been reported from methane-seep deposits of Cretaceous age (Kaim et al. 2009, 2013; Kaim 2022), indicating that this genus has a long history of taking advantage of methane-seep areas.
Middle to Upper Miocene, northern Italy.
Order Lepetellida Moskalev, 1971
Family Fissurellidae Fleming, 1822