Dizoniopsis bilineata (Hörnes, 1848)

* Cerithium bilineatum Ho ̈rnes 1848: 21.

Cerithiopsis trilineata [sic] Haern. [sic]— Mayer 1864: 66.

Cerithiopsis (Dizoniopsis) bilineata Ho ̈rnes, 1856 [sic]— Brébion 1964: 247.

Cerithiopsis (s. lat.) bilineata (Hörnes, 1848)—Landau et al. 2006: 14, text-fig. 1, figs. 1-3.

Dizoniopsis bilineata (Hörnes, 1848)— Chirli 2009: 14, pl. 7, figs. 1-12.

Dizoniopsis bilineata (Hörnes, 1848)— Landau et al. 2018: 237, pl. 62, figs. 1-2 (cum syn.).

non Cerithiopsis (Dizoniopsis) bilineata (Hörnes)— Nordsieck 1968: 70, pl. 11, fig. 43.10 [= Dizoniopsis coppolae (Aradas, 1870)].

non Cerithiopsis (Dizoniopsis) bilineata (Hörnes, 1856 [sic])— Nordsieck 1976: 7, fig. 12: 18, unnumbered fig. [= Dizoniopsis concatenata (Conti, 1864)].

? non Dizoniopsis bilineata (Hörnes, 1848)—Gründel 1980: 229, figs. 14-15 [= Dizoniopsis coppolae (Aradas, 1870)].

non Dizoniopsis bilineata (Hörnes, 1848)— Giannuzzi-Savelli et al. 1999: 44, fig. 76 [= Dizoniopsis concatenata (Conti, 1864)].

Santa Maria material examined. One specimen, size not indicated, from Feteirinhas (= Ponta das Salinas), Santa Maria Island, Azores, Touril Complex, Lower Pliocene .

Discussion. Mayer (1864: 66) recorded one specimen as Cerithiopsis bilineata Ĥrnes, 1848 from Feteirinhas (= Ponta das Salinas), but in the text wrote trilineata instead of bilineata (lapsus). Seila trilineata (Philippi, 1836) was also recorded from Santa Maria Island by Mayer (1864: 67), but from the Pleistocene deposits of Praia and Prainha.

Cerithium bilineatum Ho ̈rnes, 1848 is the type species for Dizoniopsis Sacco, 1895, which is characterised by having only two spiral cords on spire whorls instead of three in Cerithiopsis . To be certain of the species, the protoconch must be preserved. No further specimens are available; however, we accept this determination as D. bilineata is widespread in the European Miocene and Pliocene.

Distribution. Middle Miocene: Paratethys, Austria (Hörnes 1848; Landau et al. 2006). Upper Miocene:Atlantic (Tortonian), NW France (Brébion 1964; Landau et al. 2018). Lower Pliocene: Atlantic, Santa Maria Island, Azores (Mayer 1864); Mediterranean, Italy (Chirli 2009). Upper Pliocene: western Mediterranean, Estepona Basin, Spain (Landau et al. 2006).