Saxbyoceras, 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 : 57

Genus Saxbyoceras gen. nov.

urn:lsid:zoobank.org:act:F9537354-5080-41CB-9ADF-D443823ECEAD

Type species

Saxbyoceras kingpooli gen. et sp. nov., from Saxby shore, Kõrgessaare Formation, Vormsi Island, Estonia; Vormsi Regional Stage.

Diagnosis

Slightly endogastrically curved brevicone with smooth (or nearly so) conch surface; conch cross section circular or slightly compressed; mature body chamber slightly curved, not (or only very slightly) constricted; sutures are nearly straight and directly transverse; siphuncle eccentrically positioned toward the concave side of the conch with widely expanded segments; septal necks very short or achoanitic; endosiphuncular or cameral deposits not known.

Etymology

From Saxby, Vormsi Island, Estonia, the type locality of the type species of this genus.

Remarks

The new genus is best compared with Siljanoceras Kröger, 2013 , from which it differs in having a much smaller angle of expansion (33° in Siljanoceras ) and an endogastrically curved conch.