Diagnoza

The axial ribs are weak, prosocline, and produce nodes at the intersections with the spiral ribs. The number of nodes increases during ontogeny. The abapical spiral rib has about 30-45 nodes per whorl on the terminal part of the shell. The suture is weakly incised. The base is strongly convex and ornamented by 7-10 equally strong spiral ribs and similarly sized interspaces. The aperture is oval and has a weak anterior channel.

Porównanie

Eucyclus verrucatus Gerasimov, 1992, from the Callovian of Gzhel (Moscow region) has a more slender shell, the teleoconch whorls are ornamented by five spiral ribs, the base is more strongly convex and is ornamented by a higher number of spiral ribs, and the nodes on the first teleoconch whorl are weaker but more numerous.

Autekologia

Występowanie geograficzne

Kłęby (Western Pomerania), Poland

Zasięg czasowy

late Oxfordian.

Materiały muzealne

Three specimens in Schmidt collection designated; additional 21 specimens (BGR, Buchholz, Beckert, GG, and ZPAL)

Literatura

Gründel, J & Kaim, A. 2006. Shallow-water gastropods from Late Oxfordian sands in Kłęby (Pomerania, Poland). Acta Geologica Polonica 56, 2, 121‒157.

Karczewski, L. 1980. Gromada Gastropoda Cuvier, 1797 In: Malinowska, L. (ed.), Budowa Geologiczna Polski. Tom III: Atlas skamieniałości przewodnich i charakterystycznych. Część 2b, Mezozoik, Jura, 414‒434. Wydawnictwa Geologiczne; Warszawa.

Schmidt, M. 1905. Über Oberen Jura in Pommern. Abhandlungen der Königlich Preußsischen Geologischen Landesanstalt und Bergakademie, Neue Folge, 41, 1‒222