Diagnoza

Small shell; whorls with 2 keels and trapezoidal cross-section; growth lines on the outer flank straight or obliquely, not opistocyrt; run approximately straight and orthocline from suture to suture.

Porównanie

Euomphalus pygmaeus Dunker, 1847 from the Lias is very similar but larger (about 2.5 mm in diameter) and the whorls increasing more rapidly in width; Discohelix calculiforme Dunker, 1847, also from the Lias, is much larger (approximately 15 mm) and has weak but numerous axial ribs.

Autekologia

Występowanie geograficzne

Germany; in Poland only in the Kłęby borehole.

Zasięg czasowy

Mid Jurassic; late Bajocian to mid Callovian

Materiały muzealne

Over 70 specimens (BGR).

Literatura

Gründel, J. 2000. Archaeogastropoda aus dem Dogger Norddeutschlands und des nordwestlichen Polens. Berliner geowissenschaftliche Abhandlungen, Reihe E, 34: 205–253.