Eunerinea sp. 2

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. 2

Plate 16: fig. 14

?part 1882 - Aptyxis kelheimensis sp. nov. - Schlosser: 77,?pl. 11, figs 3, 7; non pl. 11, figs 4-6.

Material.

One specimen from Saal, collection Lang, SNSB-BSPG 2021 XV 79.

Description.

The specimen is 32 mm high. The early whorls are lacking. The shell is very slender. The whorls are very broad in relation to their height. The whorl face is concave. The suture is situated on a bulge that is formed by two neighbouring whorls. The bulge is demarcated abapically by a furrow-like deepening. There is no other ornament. The base and aperture are not preserved. Within the last preserved whorl, there are at least two columellar plaits. The aperture probably has a siphonal canal.

Relationships.

Aptyxis kelheimensis Schlosser, 1882 is quite similar in part and possibly conspecific to the present specimen ( Schlosser 1882, pl. 11, figs 3, 7; non figs 4-6). However, this species has several spiral cords and allegedly lacks plaits in the aperture. Nerinea cincta Münster in Goldfuss, 1844 is very similar but much younger (Gosau-Cretaceous) and has more concave whorls. Nerinea goldfussi d’Orbigny sensu Schlosser (1882) is much larger, has higher whorls and a spiral cord at mid-whorl. Nerinea petersi Gemmellaro, 1870 has a rounded transition from whorl face to base, the whorls are higher and the whorl face is less concave; the situation of the suture is unclear in this species. Nerinea curmontensis Loriol in Loriol, Royer and Tombek (1872) lacks a bulge, has a suprasutural row of knobs and a straight whorl face. Nerinea cincta Münster sensu Schafhäutl (1863) is much larger and has higher whorls. Ptygmatis intermedia Pchelintsev, 1926 and P. exelsa Pchelintsev, 1926 have higher whorls and a more convex base. Nerinea bruntrutana Thurmann sensu Zeuschner (1849) is larger, has a distinct umbilicus and its whorls increase more rapidly in width.

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.