Specimen NHMW 1867/0008/0029 (original illustration from Laube, 1867; pl.3, fig. 11) from Mid Jurassic of Balin in apertural view.

Diagnoza

The shell is 6.5 mm high and the turns are convex, the seams clear. A narrow ramp is delimited abapically by an accentuated spiral furrow. A second spiral furrow directly abapical of the latter is formed on the last turn. On both sides of the seam, 4–5 spiral furrows are relatively close together, two of them are visible above the seam. This area is accompanied by a wide, sculpture-free shell area on the ad- and abapical side. The case was apparently damaged several times during the life of the animal. On the last half turn, the case is covered fairly evenly and densely with spiral furrows after such an injury (approx. 25 from the edge of the ramp to the center of the base). On the base, the furrows become increasingly wider and deeper; after all, they are wider than the spiral ribs. The growth lines run prosocyrted from the ramp to the base. The longitudinally oval mouth is adapically pointed. The outer lip is convex, with the inner lip the parietal and columellar areas meet at an angle.

Porównanie

Actaeon lorieri Hébert & Eudes-Deslongchamps, 1860 has two spindle folds.

Autekologia

Występowanie geograficzne

France, in Poland only in Balin.

Zasięg czasowy

Mid Jurassic

Materiały muzealne

Material from France and 1 specimen from Balin (NHMW 1867/0008/0029).

Literatura

Cossmann, M. 1895. Contribution à la paléontologie Française des terrains jurassiques. Étude sur les Gastropodes. Mémoires Societie géologique de France (5), 11: 1–167.

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 für Mineralogie und Petrographie, Geologie und Paläontologie, Anthropologie und Prähistorie, 193-288.

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