Aptyxiella quenstedti Geiger, 1901

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

Aptyxiella quenstedti Geiger, 1901

Plate 1: fig. 7

part v1858 - Nerinea grandis nuda - Quenstedt: 766, pl. 94, fig. 4 (non fig. 5).

part v1881-1884 - Nerinea grandis nuda - Quenstedt: p. 553, pl. 207, fig. 2 (non fig. 1).

*1901 - Aptyxiella quenstedti sp. nov. - Geiger: p. 278, pl. 11, fig. 1.

1997 - Aptyxiella quenstedti Geiger, 1901 - Hägele: 133, fig. p. 133 lower right.

Material.

One specimen from Nattheim ( Tübingen: Quenstedt collection).

Description.

The specimen illustrated by Quenstedt (1881-1884: pl. 207, fig. 2) is a 29 mm high fragment consisting of three whorls. Geiger (1901, pl. 11, fig. 1; copied herein in Plate 1 : fig. 7) used another, better preserved specimen. In Quenstedt‘s (1881-1884) specimen, approximately half of shell wall is broken off. The flanks are straight. The suture is slightly impressed. No ornament is visible. The base is anomphalous. The aperture has a weak columellar plait.

Relationships.

Nerinea grandis nuda Quenstedt, 1858 is much larger and has seemingly no plaits. The very similar and maybe identical Aptyxiella planata (Quenstedt) lacks a columellar plait. Hägele (1997) also claimed that Aptyxiella quenstedti has a more convex whorl face, but the specimen illustrated by Geiger (1901) does not show this.

Figures

Plate 1. (1 - 3) Cossmannea desvoidyi (d'Orbigny, 1851). (1 - 2) collection Sauerborn, Nattheim area; (1) lateral view, height 23.8 cm; (2) last whorls with aperture, height 8 cm. (3) University Tuebingen, collection Quenstedt), Nattheim, lateral view, height 130 mm (original of Quenstedt 1881 - 1884, pl. 205, 60). (4 - 6) Aptyxiella planata (Quenstedt, 1858), SNSB-BSPG 2021 XV 1, Nattheim-Rinderberg; (4 - 5) lateral views, height 70 mm; (6) aperture, height of detail 70 mm. (7) Aptyxiella quenstedti Geiger, 1901, Nattheim, lateral view (copy from Geiger 1901, pl. 11, fig. 1).