Nerinea Gen. et sp. indet.

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

Nerinea Gen. et sp. indet.

Plate 19: figs 9-11

Material.

One specimen from Saal, collection Lang, SNSB-BSPG 2021 XV 92.

Description.

The shell fragment is 19 mm high. The whorls are relatively high. The whorl face is straight. The sutures are indistinct. The whorls are ornamented with a subsutural row of axially elongated, opisthocline knobs. Below it, the whorl face is ornamented with three spiral cords: a weak upper one, then a stronger one and again a weak spiral cord. All spiral cords are knobby. The size of the knobs corresponds to the strength of the spiral cords. The knobs of the bordering spiral cord emerge from the abapical suture. The bordering spiral cord is strong and marks the angular transition from whorl face to the weakly convex base. The base is ornamented with at least one distinct spiral cord and possibly with additional weaker ones. The growth lines are weakly prosocyrt on the base and almost straight orthocline on the whorl face. They curve strongly backward immediately below the adapical suture. The aperture is rhomboid and has a siphonal canal. Only a single strong parietal plait is visible.

Relationships.

Nerinea binodosa Étallon sensu Loriol in Loriol and Bourgeat (1886-1888: pl. 9, fig. 6) is larger, the adapical knobs are prosocline, it lacks a distinct row of knobs below mid-whorl, the knobs on the bordering spiral are larger, less numerous, almost fully exposed above the abapical suture, and the base is covered with distinct spiral cords. Nerinea oppeli Gemmellaro, 1870 is larger, the knobs on the bordering spiral are larger, almost fully exposed above the abapical suture, and the subsutural knobs are smaller and not as distinctly elongated. Nerinea loreti nom. mut. sensu Cossmann (1898) has higher whorls, a concave whorl face, the subsutural knobs are smaller and not elongated, the knobs on the bordering spiral are larger and almost fully exposed above the abapical suture, and its whorl face is covered with numerous spiral cords.

Figures

Plate 19. (1 - 2) Nerinea bruntrutana Thurmann, 1832 sensu Quenstedt (1881 - 1884); University Tuebingen (collection Quenstedt), Nattheim; (1) aperture, height ca. 22 mm; (2) lateral view (original Quenstedt 1881 - 1884, pl. 206, fig. 2). (3 - 4) Nerinea mandelslohi Bronn sensu Quenstedt (1881 - 1884); (3) University Tuebingen (collection Quenstedt), Nattheim, fragment in lateral view, height ca. 31 mm (original Quenstedt 1881 - 1884, pl. 206, fig. 11). (4) University Tuebingen (collection Quenstedt), Nattheim, fragment in lateral view, height ca. 21 mm (original Quenstedt 1881 - 1884, pl. 206, fig. 12). (5) Nerinea teres (Goldfuss, 1844) sensu Quenstedt (1881 - 1884), collection University Tuebingen (collection Quenstedt), Nattheim, fragment in lateral view, height 12 mm (original to Quenstedt 1881 - 1884, pl. 206, fig. 26). (6 - 8) Nerinea? sp. 1; (6) SNSB-BSPG 2021 XV 90, Saal (collection Lang), lateral view, height 67 mm. (7 - 8) SNSB-BSPG 2021 XV 91, Saal (collection Schaefer); (7) lateral view, height 21 mm; (8) detail of ornament, width 8.5 mm. (9 - 11) Gen. et sp. Indet, SNSB-BSPG 2021 XV 92, Saal (collection Lang); (9) lateral view, height 19 mm; (10) base, width 9 mm; (11) last whorls with aperture, height 12 mm.