Neuburgensia rara, Gründel & Nützel, 2024

Gründel, Joachim & Nützel, Alexander, 2024, Late Jurassic (Upper Kimmeridgian) gastropods from Saal near Kelheim (Germany, Bavaria), Zitteliana 98, pp. 19-72 : 19-72

Neuburgensia rara sp. nov.

Plate 10: figs 7–9

Etymology.

Latin rare, because this species is rare.

Holotype.

SNSB-BSPG 2016 XXI 1856 , the only specimen, Saal , collection Sylla.

Diagnosis.

Shell very slender, high-spired, with many whorls; early whorls have a subsutural, weakly tuberculate bulge that is reduced on later whorls; base flat; transition from whorl face to base at sharp angulation that is almost perpendicular.

Type locality and stratum.

Upper Jurassic (Kimmeridgian) reefal limestones from the locality Saal near Kelheim, Lower Bavaria ( Gründel et al. 2015, 2022).

Description.

Shell very slender, high-spired, with many whorls; specimen is 30 mm high, with about 20 whorls, apex missing; early whorls increase more rapidly than the later ones and therefore, the early shell have a wider apical angle than later shell; early whorls with distinct subsutural bulge (sometimes nodular) emphasizing sutures; bulge reduced on later whorls; whorl face straight, sutures only slightly impressed; series of small cusps occasionally visible directly below suture; weak spiral lirae on whorl face (hardly visible due to preservation); base flat; transition from whorl face to base at sharp angulation, angle almost perpendicular with reinforced edge (visible above suture); growth lines weakly opisthocyrt on whorl face and prosocyrt on base; aperture outline rounded-rectangular, details of aperture not preserved; columella hollow.

Remarks.

In other Neuburgensia species, the subsutural bulge is not reduced during ontogeny.

Figures

Plate 10. (1) Neuburgensia angulata sp. nov., holotype, SNSB-BSPG 2016 XXI 1849, collection Lang, lateral view, height 24 mm. (2–3) Neuburgensia angulata sp. nov., paratype, SNSB-BSPG 2016 XXI 1850, collection Lang, (2) earliest preserved whorls in lateral view, height 1 mm, (3) lateral view, height 6 mm. (4) Neuburgensia angulata sp. nov., paratype, SNSB-BSPG 2016 XXI 1851, collection Lang, lateral view, height 10 mm. (5) Neuburgensia angulata sp. nov., paratype, SNSB-BSPG 2016 XXI 1852, collection Schäfer ¸ basal view, width 6 mm. (6) Neuburgensia angulata sp. nov., paratype, SNSB-BSPG 2016 XXI 1853, collection Lang, oblique apical, width 6.5 mm. (7–9) Neuburgensia rara sp. nov., holotype, SNSB-BSPG 2016 XXI 1856, (7) lateral view, height 30 mm, (8) early whorls in lateral view, height ca. 7 mm, (9) middle whorls in lateral view, height 12 mm. (10, 11) Purpuroidea lapierrea (Buvignier, 1843), SNSB-BSPG 2016 XXI 1857, lateral and oblique views, height 30 mm. (12, 13) Columbellaria corallina (Quenstedt, 1852), SNSB-BSPG 2016 XXI 1859, (12) apex in lateral view, height 10 mm, (13) lateral view, height 19 mm. (14, 15) Columbellaria corallina (Quenstedt, 1852), SNSB 1860, lateral and slightly oblique lateral views, height 21 mm. (16) Diarthema aspera sp. nov., paratype, SNSB-BSPG 2016 XXI 1862, lateral view, height 44 mm.