Specimen  NHMW 1867/0008/0002 d from Mid Jurassic of Balin in apertural view.

Diagnoza

Late coils have a keel located approximately in the middle. The contour of both sides of the keel is concave. The cusps are initially large, wide (approx. 9 per turn) and extend like ribs abapically. On the last coil they become increasingly smaller and more numerous and at the end apparently disappear completely. The whole coil, including the base, is densely covered with spiral ribs.

Porównanie

Closely similar Pietteia callamus Gründel, 2001 is much slimmer, finely ornamented and with two strong spiral ribs that give octoconal contour. Pietteia seminudum (Hébert & Eudes-Deslongchamps, 1860) is slimmer as well, coils are higher and Arial rias are less numerous but stronger.

Autekologia

Występowanie geograficzne

Southern Germany and Poland (Balin).

Zasięg czasowy

Mid Jurassic

Materiały muzealne

5 specimens from Balin (NHMW 1867/0008/0002 d-g; NHMW 1853/0038/0078).

Literatura

Brösamlen, R. 1909. Beitrag zur Kenntnis der Gastropoden des schwäbischen Jura. Paläontographica, 56, 177–321.

Gründel, J. 2003b. Gastropoden aus dem Bajocium und Bathonium von Sengenthal und Kinding, Franken (Süddeutschland). Zitteliana, A 43: 45–91.

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.