Diagnoza

Porównanie

The shell is highly conical, its apex is a little blunt. The coils flanks are almost straight, the seams accentuated by a very narrow heel. There is no sculpture. The barely convex, imperforate base is set off on a rounded edge. It is as well without sculpture, only opisthocyrt growth lines can be seen. The aperture lumen is almost round. The columella is widened and deepened in a crescent shape. Trochus ibbetsoni Morris & Lycett, 1851, to which Laube (1867) assigned this species, is larger, the flanks are slightly concave and the transition from flank to base forms a clear edge. Proconulus ibbetsoni (Morris & Lycett, 1851) sensu Szabó (1983) is represented only by two coils. The transition from the flank to the base is more strongly edged, the last turn has a spiral sculpture.

Autekologia

Występowanie geograficzne

Balin

Zasięg czasowy

Mid Jurassic

Materiały muzealne

1 specimen from Balin (NHMW 1867/0008/0017).

Literatura

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.

Morris, J. & Lycett, J. 1851. A monograph of the Mollusca from the Great Oolite, chiefly from Minchinhampton and the coast of Yorkshire. 130 pp. Palaeontographical Society, London.

Szabó, J. 1983. Lower and Middle Jurassic gastropods from the Bakony Mountains (Hungary). Part V: Supplement to Archaeogastropoda, Caenogastropoda. Annales historico-Naturales Musei Nationalis Hungarici, 75, 27–46.