Fig. 5H–L
Fissurella costicillatissima Sacco, 1896: 11, pl. 1 figs 46–47.
Fissurella costicillatissima – Ferrero Mortara et al. 1984: 277, pl. 51 fig. 5a–b. — Harzhauser et al. 2014: 87, pl. 1 figs 3–4, 5a–b.
? Fissurella cf. costicillatissima – Cowper Reed 1932: 516.
? Fissurella costicillatissima – Konior & Krach 1965: 78, pl. 4 fig. 10.
? Fissurella aff. costicillatissima – David 1967: 12.
ITALY – Tuscany • 2 specs; Le Colline; MSF 1213 (L = 15 mm), MSF 1214 (L = 20.5 mm).
Fissurella costicillatissima was originally described from the Upper Miocene of the Turin hills (Sacco 1897). It could potentially be widely distributed in the Miocene of the Mediterranean region, with a reliable record from an Early Miocene rocky shore deposit in the North Alpine Foreland Basin (Harzhauser et al. 2014), and unconfirmed records from the Upper Miocene of Cyprus (Cowper Reed 1932), Poland (Konior & Krach 1965), and France (David 1967). A specimen illustrated as Fissurella cf. costicillatissima from the Mio-Pliocene of Lanzarote (Canary Islands) has a much more elongate foramen (Betancort Lozano 2012: 96, pl. 4 fig. 3) and is unlikely to belong to this species. With this potentially wide geographic distribution, Fissurella costicillatissima is not unlike the extant fissurellid Diodora tanneri Verrill, 1882, which is widespread in the western North Atlantic Ocean (Verrill 1882; Barroso et al. 2016; Meyer et al. 2017) and has been reported from methane seeps in the Gulf of Mexico (Cordes et al. 2010) and the southern Caribbean Sea (Gracia et al. 2012).
Middle to Upper Miocene, northern Mediterranean basin.