Nerinea grandis nuda Quenstedt, 1858 nomen dubium

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 grandis nuda Quenstedt, 1858 nomen dubium

part v*1858 - Nerinea grandis nuda - Quenstedt: 766, pl. 94, fig. 5 (non fig. 4).

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

Material.

One specimen ( Tübingen: collection Quenstedt).

Description.

The specimen illustrated by Quenstedt (1881-1884, pl. 207, fig. 1) is 77 mm high. It consists of well over two whorls. Half of the shell wall is broken off. The whorls are high, the whorl face is straight. The surface of the whorls is completely encrusted. No ornament is visible. The suture is indicated with red ink but it is unclear whether this interpretation of the situation of the suture is correct. No plaits are visible inside the shell. Aperture and base are not preserved.

Remarks.

Quenstedt (1858, 1881-1884) assigned two specimens to Nerinea grandis nuda which differ strongly from each other: a large and a small one. However, he considered only the specimen illustrated by him (Quenstedt 1858, pl. 94, fig. 5) as the "real Nerinea grandis Nerinea nuda " (p. 766). Referring to that, Geiger (1901) based Aptyxiella quenstedti Geiger, 1901 on the smaller specimen (see also treatment of that taxon herein). Nerinea grandis nuda , which is based on a fragment, cannot be sufficiently characterized and is here regarded as a nomen dubium. Geiger (1901) assigned this specimen to Nerinea nantuacensis d’Orbigny, 1851.