Eustoma sp.

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

Eustoma sp.

Plate 8: figs 12–14

Material.

3 specimens, SNSB-BSPG 2016 XXI 1801 –1803.

Description.

Shell high-spired, slender, with gradate spire and narrow ramp; a specimen 31 mm high; shell sides straight; whorl face with strong axially elongated subsutural nodes (9–10 per whorl) extending over more than of whorl height; broad, sometimes slightly nodular spiral cord at rounded angular transition to base; base slightly convex; whorls face and densely covered with spiral cords of variable strength separated by narrow furrows; aperture incompletely preserved with straight siphonal canal.

Remarks.

Ditretus sp. , cf. rostellaria ( Buvignier, 1852) has a similar ornament but differs in its stouter (less slender) shell shape, in having fewer whorls, a more delicate sculpture, and a very short abapical canal. Eustoma tuberculosa Piette, 1855 is larger and more slender, the aperture of adult specimens terminates adapically in a long, triangular extension. Diatinostoma aff. germaini Étallon sensu Yin (1931) has a wider, more triangular shell shape, spiral cords are largely missing, the transition from whorl face to base has a clear cord-like edge.

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.