The Lower Pliocene marine gastropods of Santa Maria Island, Azores: Taxonomy and palaeobiogeographic implications Author Sacchetti, Claudia 0000-0002-3225-3139 claudiasacc@icloud.com Author Landau, Bernard 0000-0002-7768-8494 bernardmlandau@gmail.com Author Ávila, Sérgio P. 0000-0002-3225-3139 claudiasacc@icloud.com text Zootaxa 2023 2023-05-24 5295 1 1 150 http://dx.doi.org/10.11646/zootaxa.5295.1.1 journal article 53396 10.11646/zootaxa.5295.1.1 82286fdc-a858-447c-9980-da2e8985d19c 1175-5326 7965273 F3A52660-70B8-439F-A7A0-F45ADC975EA5 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).