Exelissa ursicina ( Loriol, 1889 in Loriol and Koby)

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

Exelissa ursicina ( Loriol, 1889 in Loriol and Koby)

Plate 9: figs 13, 14

2022 – Exelissa ursicina (De Loriol, 1889 in De Loriol and Koby) – Gründel, Hostettler and Menkveld-Gfeller: 50, pl. 7, figs 14–20, pl. 8, figs 1–5 (here more chresonymy and synonymy).

Material.

1 specimen, SNSB-BSPG 2016 XXI 1836 .

Description.

Shell high-spired, slender; specimen 10 mm high; sutures shallow but distinct; whorl face with approximately 7 strong, orthocline axial ribs which weaken on base; distance between axial ribs wider than axial ribs; 6–7 strong, spiral cords on whorl face; intersections of axial ribs and spiral cords without nodes; transition from whorl face to convex base evenly rounded; base covered with spiral cords that are slightly stronger than those on whorl face; aperture unknown.

Remarks.

According to Gründel et al. (2022), Exelissa ursicina from the Oxfordian is a variable species. The present specimen shows no clear differences to some variants of the Oxfordian species (see e. g., Loriol in Loriol and Koby 1889, Plate 8 : figs 1–2, 5).

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.

Plate 9. (1, 2) Ditretus sp., cf. rostellaria (Buvignier, 1852), SNSB SNSB-BSPG 2016 XXI 1808, (1) lateral view, height 25 mm, (2) detail of ornament, height 12 mm. (3, 4) Ditretus sp., cf. rostellaria (Buvignier, 1852), SNSB-BSPG 2016 XXI 1809, lateral views, height 23 mm. (5) Cryptoptyxis? spinosus sp. nov., holotype, SSNSB-BSPG 2016 XXI 1824, apertural and abapertural lateral views, height 22 mm. (6, 7) Coninoda strekwera Gründel, Keupp & Lang, 2019, SNSB-BSPG 2016 XXI 1827, lateral view and longitudinal section, height 33 mm. (8, 9) Tropacerithium cumaritum Gründel, Keupp & Lang, 2019, SNSB-BSPG 2016 XXI 1830, (8) detail of last whorl, height 4 mm, (9) lateral view, height 7 mm. (10–12) Exelissa? aff. corallense (Buvignier, 1843), SNSB-BSPG 2016 XXI 1835, locality 1985, above coral stock, level 2 (“ Fundort 1985, über Korallenstock, Sohle 2 ”), (10) lateral view, height 12 mm, (11) apex in lateral view, height 5 mm, (12) last two whorls in lateral view, height 7 mm. (13, 14) Exelissa ursicina (Loriol in Loriol and Koby 1889), SNSB-BSPG 2016 XXI 1836, (13) l ateral view, height 10 mm, (14) basal view, width 4.5 mm. (15–17) Turritella lucagrita sp. nov., holotype, SNSB-BSPG 2016 XXI 1840, (15) lateral view, height 75 mm, (16) earliest preserved whorls in lateral view, height 40 mm, (17) last whorls in lateral view, height 46 mm. (18) Nudivagus? sp. 2, SNSB-BSPG 2016 XXI 1844, lateral view, height 35 mm. (19) Neuburgensia angulata sp. nov., paratype, SNSB-BSPG 2016 XXI 1848, collection Lang, last whorl with aperture, height 6 mm.