Pennsylvanian Nautiloid

[blackmoth]

This one is found in Yangquan of Shanxi, China, together with Domatoceras and Huangheceras, Pleuronautilus etc.

This one has an envolute , slowly exapanding coil, with an edge on the bottom side (missing on the top side possibly due to

wear and tear) . It seems to have an wavy profile, possiblely due to large nodes.

any clue what it could be?