Diagnoza

Porównanie

The slim shell has almost straight sides and hardly any accentuated seams. On later coils, the side outline becomes more or less clearly concave due to a wide, indistinctly delimited constriction. The base is set off at early coils by a rounded edge, which is widely curved on later coils. No sculpture is recognizable. The growth lines are partially reinforced. They run opisthocyrt on the flanks and somewhat prosocyrt under the adapical suture by steeping, on the base prosocyrt. The teardrop-shaped aperture is adapically sharply pointed, abapically rounded.The species is very similar to Pseudomelania trochiformis (Piette, 1857), which is quite variable, but usually not as slim, has wider coils in relation to its height and no concavity on the flanks. Pseudomelania (Chemnitzia) procera Deslongchamps sensu Couffon (1919) has such a concavity, but the shell of this species is noticeably wider.

Autekologia

Występowanie geograficzne

Balin and Kościelec (Chrzanów), Poland

Zasięg czasowy

Mid Jurassic

Materiały muzealne

10 specimens from Balin (NHMW 1853/0038/0096c-k and 1853/0038/0097) and 3 from Kościelec (NHMW 1867/0008/0038).

Literatura

Couffon, O. 1919. Le Callovien du Chalet, commune de Montreuil-Bellay (M.-&-L.). 245 pp. G. Grassin, Angers.

Gründel, J. 2012. Neubearbeitung der von Laube 1867 beschriebenen Gastropoden fauna aus dem mittleren Jura von Balin/Polen. Annalen des Naturhistorischen Museums in Wien. Serie A, 114, 193–288.

Laube, G. C. 1867. Die Gastropoden des braunen Jura von Balin. Denkschriften der kaiserlichen Akademie der Wissenschaften, 28, 1–28.