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 Janthina krejcii Beu, 2017 Plate 2 D 1 -D 3 Janthina typica (Bronn) — Krejci-Graf et al . 1958: 336 , pl. 3, fig. 6, pl. 4, fig. 11 [ non Janthina typica (Bronn, 1861) ]. * Janthina krejcii Beu 2017: 173 , figs. 26A-N. Type material. Holotype SMF10135a, height 23.0 mm, diameter 30.8 mm with two paratypes SMF10135b–c, labelled “ Azoren , Santa Maria, Wegknick [road bend] bei Praia, K. Krejci-Graf ,” 23 April 1955 , in SMF. The type locality is the upper, seaward-directed hairpin bend on the road descending from Almagreira to the beach at Praia, Santa Maria Island, illustrated by Krejci-Graf et al . (1958 : fig. 4) (a lower, landward-directed hairpin bend is in the underlying volcanic rocks). Ten paratypes GNSWM 18973, Macela viewpoint. Other material. No further specimens known. Description. Teleoconch moderately large, short and wide (D/H 1.2–1.35), spire very low to almost flat, whorls evenly convex; completely covered with fine, straight, acline axial ridges, but without obvious spiral sculpture. Outer lip straight, acline; sinus small, moderately deep, semicircular to weakly V-shaped, situated at base of lip. For fuller description, see Beu (2017: 173) . Discussion. Janthina krejcii Beu, 2017 resembles J. typica (Bronn, 1861) and J. chavani ( Ludbrook, 1978 ) in its uniform sculpture of fine, closely spaced, straight axial ridges over the entire teleoconch and in its semicircular to shallowly V-shaped outer-lip sinus situated at the base of the lip. However, it differs from them both in its consistently very low to almost flat spire, so that width is significantly greater than height in all specimens, and in its complete lack of obvious spiral sculpture ( Beu 2017: 173 ). For further discussion, see under J. typica ( hoc opus ) and Beu (2017: 173) . Distribution. Lower Pliocene: Atlantic, Santa Maria Island, Azores ( Beu 2017 ).