Description

Description Specimen MB. C. 31292 (Fig. 18 A) is a fragment of a specimen with a phragmocone diameter of about 80 mm. The whorl profile is crescent-shaped with a broadly rounded venter that continues onto the flanks, a rounded umbilical margin and a convex umbilical wall. The whorl section is moderately depressed (ww / wh = 1.60) and the whorl embraces the preceding one to a rather high degree (IZR = 0.37). The septal surface shows the striking bilobate shape with a median ridge that separates the septum in two concave bulges. The suture line forms a narrow, subangular saddle on the venter, a wide, broadly rounded lobe on the flank and another smaller lobe on the umbilical wall (Fig. 18 C).

Common Names

Taxonomic Hierarchy

Kingdom: Animalia

Phylum: Mollusca

Class: Cephalopoda

Order: Nautilida

Family: Ephippioceratidae

Genus: Ephippioceras

Species: Ephippioceras pygops Korn & Klug, 2023