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 Lautoconus cf. anomalomamillus ( Sacco, 1893 ) Plate 5 N 1 -N 2 cf. * Conus ( Cheliconus ) [ sic ]) taurinensis ? var. anomalomamilla Sacco 1893: 99 , pl. 9, fig. 52. cf. Conus ( Chelyconus ) taurinensis ? var. anomalomamilla Sacco, 1893 — Ferrero Mortara et al. 1984: 128 , pl. 20, fig. 2. cf. Conus ( Chelyconus ) cfr. anomalomamillus ( Sacco, 1893 ) [ sic ]—Muñiz Solís 1999: 37, figs. 6A-D. Santa Maria material examined. Maximum height 22.0 mm, width 11.0 mm. DBUA-F 924-1 (1), Malbusca; DBUA-F 946-B (1) Ponta dos Cedros, Santa Maria Island, Azores , Touril Complex, Lower Pliocene. Description. Shell small for genus, coniform, with mammillate spire. Protoconch and earliest teleoconch whorls missing. Spire whorls weakly convex in profile, smooth, separated by moderately impressed linear suture. Last whorl broadly and roundly shouldered, almost straight-sided below. Sculpture absent, except for a few cords over the siphonal fasciole. Apertural side obscured by matrix. Discussion. The specimens from Santa Maria are very similar to what Muñiz Solís (1999: 37, figs. 6A-D) called Conus ( Chelyconus ) cfr. anomalomamillus Sacco, 1893 . They are characterised by their mammillate spires and convex spire whorls without spiral sculpture. Muñiz Solís’ material is from the lowermost Piacenzian Estepona Basin deposits. Although the Estepona assemblages are Upper Pliocene Piacenzian rather than Lower Pliocene Zanclean as are the Santa Maria assemblages, both were part of Pliocene Tropical MPPMU1. Whether they are conspecific with the holotype from the Lower Miocene Colli Torinesi of Italy needs further confirmation. Distribution. Lower Pliocene: Atlantic, Santa Maria Island, Azores (this paper). Genus Plagioconus Tucker & Tenorio, 2009 Type species. Conus elatus Michelotti, 1847 ( Tucker & Tenorio 2009: 111 ), by original designation. Miocene, Europe.