''Cheiloceras'' is a subglobular to thickly lenticular

goniatite Goniatids, informally goniatites, are ammonoid cephalopods that form the order Goniatitida, derived from the more primitive Agoniatitida during the Middle Devonian some 390 million years ago (around Eifelian stage). Goniatites (goniatitids) survi ...

with a closed umbilicus from the Upper

Devonian The Devonian ( ) is a geologic period and system of the Paleozoic era, spanning 60.3 million years from the end of the Silurian, million years ago (Mya), to the beginning of the Carboniferous, Mya. It is named after Devon, England, whe ...

and type genus for the

Cheiloceratidae Cheiloceratidae is a family of ammonoid cephalopods included in the goniatitid suborder Tornoceratina in which the suture has 4 to 12 lobes, the ventral one undivided and those in the lateral areas originating as subdivisions of internal and ex ...

.GONIAT-''Cheiloceras'' entry
/ref> ''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

include '' Staffites'' and '' Dyscheiloceras''.Paleobiology Database Cheiloceratidae entry
/ref>

References

Ammonites of Africa Ammonites of Australia Late Devonian ammonites Goniatitida genera Cheiloceratidae {{Goniatitida-stub