Diagnoza

Porównanie

The shell is highly trochospiral with coils set off from one another like a staircase. The selenizone lies on the edge between the almost horizontal adapical area and vertical abapical part of the coil. On the early coils, the selenizone is followed by two adapical and three abapical spiral ribs, crossed by axial ribs that run strongly prosoclin on both sides of the selenizone. The last 1.5 turns are without sculpture. The transition to the barely convex base is formed by a rounded edge. It is only deposited against the flank by a shallow furrow. Several spiral ribs run on it. The base is evenly covered with spiral ribs. The umbilicus is wide and deep and gradually merges into the base. Trochotoma affinis Eudes-Deslongchamps, 1843 has a similar shape of the shell but differs in a lower spire, the complex sculpture on early coils and the absence of spiral and axial ribs on the last coils.

Autekologia

Występowanie geograficzne

Poland (Balin) and France.

Zasięg czasowy

Mid Jurassic

Materiały muzealne

2 x 2 specimens (NHMW 1853/0038/0086 and NHMW 1867/0008/0028).

Literatura

Eudes-Deslongchamps, J. A. 1843. Mémoire sur les Trochotoma, nouveau genre de coquilles fossiles voisin des Pleurotomaires et appartenant, comme eux, aux terrains secondaires. Mémoires de la Société Linnéenne de Normandie, 7, 100–110.

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.