Wikipedia
Gleboceras
Gleboceras is a globular gonititid from the upper Carboniferous of the Urals, named by Ruzhentsev, 1950, tentatively assigned to the Thalassoceratidae, and placed in the subfamily Gleboceratinae. The ventral (outer marginal) lobe is moderataely wide, with parallel sides. The lateral lobe is serrate.