Nerinella? sp. 1

Gruendel, Joachim, Keupp, Helmut, Lang, Fritz & Nuetzel, Alexander, 2022, Late Jurassic (Upper Kimmeridgian) Heterobranchia (Gastropoda) of the coral-facies of Saal near Kelheim and the viciniy of Nattheim (Germany), Zitteliana 96, pp. 179-221 : 179

Nerinella? sp. 1

Plate 15: figs 13-15

Material.

One specimen from Saal, collection Lang, SNSB-BSPG 2021 XV 78.

Description.

The specimen is 45 mm high and has a moderately broad shape. The whorls increase regularly in width. They are distinctly wider than high. The sutures are hardly visible. The whorls are ornamented with three spiral cords. The subsutural spiral cord is the most prominent one. All spiral cords bear small knobs. The largest knobs are on the subsutural spiral cord. In the last whorls, the knobs on the middle and suprasutural spiral cord become weaker. The base is flat and has an angular transition to the whorl face which is demarcated by a spiral cord that is probably not knobby. The growth lines on the base are prosocyrt. The aperture is not preserved. Only a strong palatal plait can be recognized.

Relationships.

Aphanoptyxis polyspira (Quenstedt) sensu Hägele (1997) has spiral cords of equal strength on the whorl face, the aperture lacks plaits, and the ornament does not become weaker during ontogeny. Nerinea nodospira Quenstedt, 1881-1884 has four spiral cords on the whorl face, the knobby ornament is stronger, and the ornament does not become weaker during ontogeny. Nerinea punctata Voltz sensu Bronn (1836) has a weak ramp so that the whorls are well separated from each other and its ornament does not become weaker during ontogeny.

Figures

Plate 15. (1 - 5) Nerinella ornata (d'Orbigny, 1852). (1 - 3) SNSB-BSPG 2021 XV 72, Saal (collection Lang); (1) lateral view, height 33 mm; (2) detail of ornament, height 10 mm; (3) whorl with plait, height 3 mm. (4) University Tuebingen (collection Quenstedt), Nattheim, lateral view, height 18 mm (original Quenstedt 1881 - 1884, pl. 205, fig. 74). (5) University Tuebingen (collection Quenstedt), Nattheim, lateral view, height ca. 14 mm (original to Quenstedt 1881 - 1884, pl. 205, fig. 75). (6 - 12) Nerinella? subscalaris (Muenster in Goldfuss, 1844). (6 - 7) SNSB-BSPG 2021 XV 63, Nattheim-Rinderberg; (6) lateral view, height 64 mm; (7) last whorls with aperture, height 38 mm. (8) University Tuebingen (collection Quenstedt), Nattheim, lateral view, height ca. 40 mm (original Quenstedt 1881 - 1884, pl. 205, fig. 63). (9) University Tuebingen (collection Quenstedt), Nattheim, lateral view, height ca. 30 mm (original to Quenstedt 1881 - 1884, pl. 205, fig. 64). (10 - 11) Collection University Tuebingen (collection Quenstedt), Nattheim; (10) lateral view, height ca. 38 mm (original to Quenstedt 1881 - 1884, pl. 205, fig. 66); (11) last whorls with aperture, height ca. 20 mm. (12) Collection University Tuebingen (collection Quenstedt), Nattheim, 26 mm, lateral view, height ca. 26 mm (original Quenstedt 1881 - 1884, pl. 205, fig. 73). (13 - 15) Nerinella? sp. 1, SNSB-BSPG 2021 XV 78, Saal (collection Lang); (13) lateral view, height 43 mm; (14) whorl with plaits, width 17 mm; (15) detail of ornament, height 17 mm.