Wikipedia
Karadzharoceras
Karadzharoceras is a discosorid genus from the Devonian, named by Zhuravleva, 1972, possibly a member of the Discosoridae. Discosorids are nautiloid cephalopods generally characterized by inflated siphuncle segments that expand into the chambers and by connecting rings that vary in composition along their length. Kadaroceras and Katageioceras are related genera.