| 词条 | Chouteauoceras |
| 释义 |
| fossil_range = Mississippian | taxon = Chouteauoceras | authority = Miller and Garner, 1953 }} Chouteauoceras is an openly coiled, gyroconic, nautiloid cephalopod from the Mississippian of North America belonging to the Nautilid family Trigonoceratidae, and superfamily Trigonocerataceae. The whorl section of Chouteauoceras is ovate, higher than wide. The surface is covered with numerous longitudinal ridges and fine growth lines. The suture has broad rounded lateral lobes and dorsal and ventral saddles. The siphuncle is small, subcentral. References
1 : Prehistoric nautiloid genera |
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。