Globularia? sp.

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

Globularia? sp.

Plate 8: figs 8, 9

Material.

1 specimen, SNSB-BSPG 2016 XXI 1794 .

Description.

Specimen largely preserved as steinkern, 42 mm wide, egg-shaped, much wider than high, low-spired; whorls rapidly increasing, convex, without visible ornament; spire whorls low; sutures shallow but distinct; last whorl large, largely covering previous ones; transition from whorl face to base evenly convex; outer lip of aperture extends far anteriorly, curved asymmetrically, with greatest width low on whorl; outer lip of aperture shows course of growth lines: almost orthocline, opisthocyrt in adapical part of whorl, prosocyrt in abapical part; aperture not exposed.

Remarks.

Neridomus canalifera (Buvignier) sensu Gründel et al. (2016) is significantly wider in relation to the height and the outer lip is not as asymmetrically curved. Neritoma (Neridomus) ovula (Buvignier) sensu Fischer and Weber (1997) is smaller and the last whorl is higher. Nerita neumeyri Zittel, 1873 is higher in relation to its width and the spire is less elevated. The present species could well belong to Neritimorpha, for instance the Palaeozoic / Triassic genus Naticopsis is similar. Specimens with known aperture would be needed for a safer systematic placement.

Figures

Plate 8. (1) Saalensia birugata Gründel, Keupp & Lang, 2019, SNSB-BSPG 2016 XXI 1779, lateral view, height 16 mm. (2–4) Loriolotrema sp., SNSB-BSPG 2016 XXI 1780, apertural, apical and basal view, width 18 mm. (5) Brachytrematidae? gen. and sp. indet., SNSB-BSPG 2016 XXI 1781, abapertural view, height 29 mm. (6, 7) Oonia kimmeridgiensis sp. nov., holotype, SNSB-BSPG 2016 XXI 1791, apertural and abapertural, height 18 mm. (8, 9) Globularia? sp., SNSB-BSPG 2016 XXI 1794, abapertural and oblique lateral view, width 42 mm. (10, 11) Pictavia? sp., SNSB-BSPG 2016 XXI 1790, abapertural and oblique abapertural view, height 20 mm. (12) Eustoma sp., SNSB-BSPG 2016 XXI 1801, apertural view, height 24 mm. (13, 14) Eustoma sp., SNSB-BSPG 2016 XXI 1802, (13) lateral view, height 31 mm, (14) basal view, width 10 mm. (15–17) Eustoma? gracilis sp. nov., holotype, SNSB-BSPG 2016 XXI 1804, (15–16) basal and lateral view, width 18 mm, (17) detail of ornament of last whorl, height 15 mm.