| 词条 | Cheiloceras |
| 释义 |
| fossil_range = Upper Devonian | taxon = Cheiloceras | authority = Frech, 1897 | subdivision_ranks = Subgenera | subdivision = See text }}Cheiloceras is a subglobular to thickly lenticular goniatite with a closed umbilicus from the Upper Devonian and type genus for the Cheiloceratidae.[1][2]Cheiloceras is sometimes split into at least three subgenera.[2] 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).[2] Related genera in the Cheiloceratidae include Staffites and Dyscheiloceras.[3] References1. ^{{cite book| first1=W.J. |last1=Arkell |first2=B. |last2=Kummel |first3=C.W. |last3=Wright |series=Treatise on Invertebrate Paleontology, Part L, Mollusca 4| title=Mesozoic Ammonoidea | publisher=Geological Society of America and University of Kansas Press |location=Lawrence, Kansas|year=1957}} {{Taxonbar|from=Q2962142}}{{Goniatitida-stub}}2. ^1 2 GONIAT-Cheiloceras entry 3. ^Paleobiology Database Cheiloceratidae entry 4 : Ammonites of Asia|Late Devonian ammonites|Goniatitida genera|Cheiloceratidae |
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