Diestoceras Foerste, 1924

Kröger, Björn, 2025, The Lyckholm acme of cephalopods - Review of the late Katian (Vormsi-Pirgu regional stages) Ordovician cephalopods of Estonia, European Journal of Taxonomy 978, pp. 1-169 : 67

Genus Diestoceras Foerste, 1924

Type species

Gomphoceras indianense Miller & Faber, 1894 , Versailles, Indiana, USA, upper part of Hudson River group, Late Ordovician; by original designation.

Diagnosis

Short diestoceratids with straight or slightly curved shell, and circular conch cross section; conch reaches largest diameter at adoral end of mature phragmocone, contracting to aperture; peristome straight, transverse, with shallow hyponomic sinus; siphuncle positioned near conch margin, cyrtochoanitic; segments subquadrate in longitudinal section; thin annulosiphonate deposits with distinctive irregular linear processes, which extend adapically and adorally without fusing from segment to segment. (Compiled from Sweet 1964b.)