Neuburgensia angulata Gründel & Nützel, 2024, sp. nov.

Neuburgensia angulata sp. nov. Plate 9: fig. 19, Plate 10: figs 1–6 2017 Nerineoidea Nr. 4 – Gründel: 33, pl. 14, fig. A. Etymology. Latin angulata – angular; after the angular transition from whorl face to the flat base. Holotype. SNSB-BSPG 2016 XXI 1849 (Plate 10: fig. 1, collection Lang). Material. Holotype and 52 paratypes (mainly fragments of various ontogenetic stages): SNSB-BSPG 2016 XXI 1848, 1850–1855, 1932–1976; most from the collection Sylla, others from collections Keupp, Schäfer, and Neubauer, all from Saal. Type locality and stratum. Upper Jurassic (Kimmeridgian) reefal limestones from the locality Saal near Kelheim, Lower Bavaria (Gründel et al. 2015, 2022). Diagnosis. Shell very slender; whorl face with subsutural nodular bulge, also on late whorls; shell flanks straight; whorl face straight to slightly concave; base flat, set off from whorl face by sharp clear edge at an almost right angle. Description. Shell high-spired, slender with numerous whorls; a specimen is 24 mm high; shell flanks straight; whorls significantly wider than high; as far as the fragmentary material can be seen, the early shell has a larger spire angle than later shell; whorl face of early whorls straight with distinct sutures; then, gradual development of subsutural knobby ridge (bulge) demarcating ramp; knobs limited to outer edge of the ramp, only occasionally visible, usually not preserved; ramp usually narrow, occasionally significantly widened and concave; outer whorl face of mature whorls straight to slightly concave; spiral sculpture not recognizable; base flat, set off from whorl face by sharp clear edge at an almost right angle; base without recognizable sculpture; aperture rounded-rectangular, with very clear, backward curved abapical canal; damaged specimens show that the columella axis is hollow. Remarks. For, the differences to Neuburgensia rara n. sp. see below. Gymnocerithium? convexoconcavum Gründel et al., 2019 (also from the Saal quarry) differs in having a convex whorl face in mature whorls as well as a subsutural concavity and the transitions from whorl face to base is evenly rounded. Neuburgensia perrotunda (Cossmann, 1913) sensu Loriol in Loriol and Koby 1889 in the sense of Gründel et al. (2022) and Cerithium valfinense Loriol in Loriol and Bourgeat 1886–1888 lack a subsutural bulge and the transition from whorl face to base is rounded. Proceritella infragranulata Janicke, 1966 has an angulated transition from whorl face to base and a slightly convex base, the suture lies on a ridge formed by two adjacent whorls, and the whorls increase in width more quickly.