Dizoniopsis bilineata (Hoernes, 1848)

Sacchetti, Claudia, Landau, Bernard & Ávila, Sérgio P., 2023, The Lower Pliocene marine gastropods of Santa Maria Island, Azores: Taxonomy and palaeobiogeographic implications, Zootaxa 5295 (1), pp. 1-150 : 42-43

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).