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 Genus Thericium Monterosato, 1890 Type species. Cerithium vulgatum Bruguière, 1792 , by original designation ( Monterosato 1890: 163 ). Present-day, Mediterranean. Note. Most authors have placed these Atlantic cerithiid species in the genus Cerithium Bruguière, 1789 . Landau et al . (2004a: 5) argued that true Cerithium ( sensu stricto ) was an Indo-Pacific genus, characterised by a flaring outer lip with a tooth-like extension abapically projecting over the anterior siphonal canal, and a relatively longer siphonal canal. We follow those authors in using Thericium Monterosato, 1890 , at full genus level.