Cheiloceras is a subglobular to thickly lenticular goniatite with a closed umbilicus from the Upper Devonian and type genus for the Cheiloceratidae. Cheiloceras is sometimes split into at least three subgenera. Cheiloceras (Cheiloceras) has evolute juvenile stages, the umbilicus closing later, while C. (Compactoceras) is subglobular with involute whorls in the early stage, later becoming compressed in form, and C. (Puncticeras) is involute in all stages. Eucheiloceras is another name for C. (Cheiloceras). Related genera in the Cheiloceratidae include Staffites and Dyscheiloceras. References Ammonites of Africa Ammonites of Australia Late Devonian ammonites Goniatitida genera Cheiloceratidae