Sigaretotrema vindobonense Harzhauser, Landau & Guzhov, 2025, nov. sp.

Sigaretotrema vindobonense nov. sp. Figs 2R, 58D 1 –D 4, 59A Type material. Holotype, NHMW 1846 /0037/0434, SL: 25.9 mm, MD: 29.1 mm, Enzesfeld (Austria), Figs 2R, 58D 1 –D 4, 59A. Type locality. Enzesfeld (Austria), Vienna Basin. Type stratum. Silty sand of the Baden Formation. Age. Middle Miocene, middle Badenian (Langhian). Etymology. After Vindobona, the Roman name for Vienna. Diagnosis. Medium sized, auriculate shell with moderately depressed spire and broad, weakly convex subsutural shelf, protoconch of 1.75 whorls. Sculpture of moderately broad, flat primary and secondary spiral cords with narrow tertiary threads, columellar callus forming broad rim. Description. Medium sized, moderately fragile shell of 2.5 teleoconch whorls, wider than high (SL/MD = 0.9). Protoconch low turbiniform, of 1.75, convex whorls, diameter ~900 μm. Spire broad conical with weakly convex whorls; apical angle 122°. Suture narrowly incised. Periphery far below mid-whorl (~25%). Sculpture of first teleoconch whorl of ~16 narrow, convex spiral cords separated by interspaces of subequal width. Slightly weaker, initially weakly granulose secondary spiral cords intercalated on late second teleoconch whorl. Primary and secondary cords becoming moderately broad with flat tops on last whorl, often with thin, narrow tertiary threads intercalated. Spiral cords weakly wavy due to interruptions by prosocyrt growth lines. Last whorl moderately expanding, with very broad, slightly convex subsutural ramp, convex periphery placed slightly below mid-whorl. Last whorl attaining 96% of total height. Base broadly convex with distinct spiral sculpture of narrow convex primary and secondary cords; growth lines weak, slightly opisthocyrt. Aperture wide, ovate, strongly prosocline, attaining 82% of total height. Parietal callus reduced to thin layer. Columellar callus forming broad rim, narrowing umbilicus to narrow chink (~4%). Basal lip and outer lip thin. No color pattern preserved. Discussion. This species is reminiscent of Sigaretotrema exclathratum (Sacco, 1891) but differs in its larger size, more depressed spire and larger protoconch. In addition, it develops more regular sculpture. Sigaretotrema deshayesi (Michelotti, 1847) and Sigaretotrema michaudi (Michelotti, 1847), from the Rupelian and Burdigalian of Italy, are smaller and have more globose shells (Robba et al. 2016: pl. 14, figs 7–9). Paleoenvironment. The deposits at Enzesfeld suggest inner neritic, coastal marine sandy environments (own data M.H.). Distribution in Central Paratethys. Badenian (Middle Miocene): Vienna Basin: Enzesfeld (Austria) (hoc opus).