2007 Goniatites tympanus: Korn et al., p. 142, fig.15-16.

Holotype: MB.C.9283.1

Shell sphaeroconic at 10 mm dm, (ww/dm = 1.00), thickly pachyconic to sphaeroconic, (ww/dm = 0.80–0.90) at 30 mm dm, and thickly pachyconic (ww/dm = 0.75–0.80) at 50 mm dm. Umbilicus very narrow in all stages larger than 10 mm dm (uw/dm = 0.10–0.16), in the adult stage slightly wider; umbilical wall flat. Growth lines crenulated, almost linear. ventral sinus extremely shallow. 200 fine spirals. External lobe V-shaped, moderately narrow (0.55 of the external lobe depth), median saddle moderately high (0.40 of the external lobe depth).