Hiiumoceras, Kröger, 2025

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 : 73-74

Genus Hiiumoceras gen. nov.

urn:lsid:zoobank.org:act:18791ECD-C1D4-4806-9566-DC4C4B724F5A

Type species

Hiiumoceras hiiuense gen. et sp. nov. Hiiumaa Island, Estonia; Pirgu Regional Stage.

Diagnosis

Small, strongly curved, exogastric cyrtocones with short body chamber; circular conch cross section; siphuncle at some distance from conch margin (subventral); ornamented with fine, directly transverse striae.

Etymology

Refers to Hiiumaa Island, the region of the type species of this genus.

Comparison

The genus is very similar to Ringoceras Strand, 1934 , from the Bønsnes Formation, late Katian, Ringerike, Norway, from which it differs in having a circular conch cross section and in lacking the longitudinal ornamentation.