Eunerinea sp. nov. 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

Eunerinea sp. nov. 1

Plate 16: figs 10-13

Material.

Three certain and a questionable specimen from the Nattheim area (all from the collection Sauerborn).

Description.

A specimen is 120 mm high. The shell is very slender, needle-shaped. The shell has a pronounced bulge at the suture that is formed by two neighbouring whorls. The suture lies on this bulge. The whorl face is distinctly concave between the bulges where it is entirely covered with numerous weak spiral cords. Details of this ornament cannot be recognized because of insufficient preservation. The base is flat with an angular transition to the whorl face. The aperture is damaged in all specimens; it probably has a rhomboid outline and a distinct siphonal canal, a columellar plait that forms the adapical border of the canal, and a parietal plait.

Remarks.

The illustrated specimen of Nerinea terebra Schübler sensu Goldfuss (1844) derives from Nattheim and could be identical with Eunerinea sp. nov. 1. The lack of spiral ornament in the specimen illustrated by Goldfuss (1844) and the lack of a palatal plait in Eunerinea sp. nov. 1 could be due to preservation. Nerinea terebra as described by Schübler (in Zieten 1830: pl. 36, fig. 3) is, however, not identical with the specimen figured by Goldfuss (1844): its shell is much broader, it has lower whorls and only a single, strong parietal plait in the aperture.

Relationships.

Nerinea contorta Buvignier sensu Cossmann (1898) is even slenderer, has higher whorls, and its whorl face is more concave. Its whorl face is ornamented with four strong spiral cords and weaker ones between them. Nerinella bononiensis Loriol sensu Cossmann (1898) is somewhat less slender, its whorls are higher and the suture is not situated on the bulge. Aptyxiella cottaldina d’Orbigny sensu Cossmann (1898) has lower whorls and it lacks plaits in the aperture. Nerinea contorta Buvignier var. sesostris Krumbeck sensu Delpey (1939) has higher whorls, its whorl face is more concave, and it lacks distinct plaits.

Figures

Plate 16. (1 - 2) Eunerinea? sequana (Bronn ex Thirria, 1836), SNSB-BSPG 2021 XV 74, Saal (collection Lang); (1) lateral view, height 42 mm; (2) base, width 13 mm. (3 - 9) Eunerinea? biplicata (Quenstedt, 1858). (3 - 4) SNSB-BSPG 2021 XV 75, Saal (collection Lang); (3) lateral view, height 36 mm; (4) shell detail, height 17 mm. (5) SNSB-BSPG 2021 XV 76, Saal (collection Lang), oblique view of base, width 16 mm. (6 - 7) SNSB-BSPG 2021 XV 77, Saal (collection Lang), lateral view and section, height 58 mm. (8 - 9) SNSB-BSPG 2021 XV 107, Saal (collection Lang), height 57 mm; (8) columellar section; (9) lateral view showing concave whorl face encrusted by colonial coral. (10 - 13) Eunerinea sp. nov. 1. (10 - 11) collection Sauerborn, Nattheim area; (10) lateral view, height 46.5 mm; (11) aperture, width 10 mm. (12 - 13) Collection Sauerborn, Nattheim area; (12) lateral view, height 120 mm; (13) detail of ornament, height 26 mm. (14) Eunerinea sp. 2; SNSB-BSPG 2021 XV 79 (collection Lang), lateral view, height 32 mm.