Diagnosis: Shells extremely large for viviparids (H > 100
mm), very thick and solid, consisting of two differently
shaped parts. First 3 to 3.5 whorls very low-trochospiral
(apical angle ca. 130°); apex distinct; umbilicus wide; shoulder
ornamented with thick, well-rounded band of lobate
spines, causing blossom-like shape in upside view. Transition
to second growth stage smooth but rapid; curling axis
abruptly shifting for ca. 10°. Second shell portion consisting
of 2.5 whorls; high-conical (apical angle ca. 45°); ornamented
with a single broad, blunt central carina, carrying low,
densely spaced open spines; umbilicus closed.