| 词条 | Chicagooceras |
| 释义 |
| name = Chicagooceras | fossil_range = Silurian | image = | regnum = Animalia | phylum = Mollusca | classis = Cephalopoda | subclassis = Nautiloidea | ordo = Orthocerida | familia = | genus = Chicagooceras | genus_authority = Foerste and Savage 1927 }} Chicagooceras is a genus of orthocerids from the Silurian of North America. Shells are short, breviconic, and faintly curved. Sutures are fairly wide spaced and though straight, slope slightly, dorso-ventrally, to the rear. Siphuncle: small, slightly ventral of the center, thought to be orthochoanitic (straight septal necks) and cylindrical (tubular connecting rings). References
2 : Prehistoric nautiloid genera|Silurian animals |
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