Gatunek typowy

Opis

Type species: Eucycloidea erratica Gründel, 1990. Callovian (Mid Jurassic),  erratic boulder from Bauer−Wehrland, Germany.
Teleoconch cone−shaped. Protoconch hyperstrophic, coaxial to strongly medio−axial, smooth. First teleoconch whorl with three or more spiral ribs. At least one of ribs changing into keel. Number of spiral ribs may increase or decrease during ontogeny. Spiral ribs crossed by weaker axial ribs orthreads. Teleoconch surface covered with spiral microornamentation.

Synonimy

Zasięg czasowy

Callovian (Mid Jurassic) to Valanginian (Early Cretaceous).

Literatura

Gründel, J. 1997a. Heterostropha (Gastropoda) aus dem Dogger Norddeutschlands und Nordpolens. I. Mathildoidea (Mathildidae). Berliner Geowissenschaftliche Abhandlungen, Reihe E25, 131–175.

Kaim, A. 2004. The evolution of conch ontogeny in Mesozoic open sea gastropods. Palaeontologia Polonica 62, 3–183.