Definition of Orthoconic. Meaning of Orthoconic. Synonyms of Orthoconic

- that the earliest nautiloids had s**** that were slightly curved. An orthoconic form evolved several times among cephalopods, and, among nautiloid cephalopods...
- coiled morphologies and giant straight-s****ed forms (orthocones). No orthoconic and only a handful of coiled species, the nautiluses, survive to the present...
- and related orthoconic nautiloid cephalopods are often confused with the superficially similar Baculites and related Cretaceous orthoconic ammonoids. Both...
- ancestry, followed by a long, moderately expanding, generally straight, orthoconic adult section with a subdorsal siphuncle connecting the chambers. The...
- detected in cephalopod fossils dating as far back as the Silurian; these orthoconic individuals bore concentric stripes, which are thought to have served...
- subclass of nautiloid cephalopods. Members of this subclass usually have orthoconic (straight) to slightly cyrtoconic (curved) s****, and central to subcentral...
- The Bactritida are a small order of more or less straight-s****ed (orthoconic) cephalopods that first appeared during the Emsian stage of the Devonian...
- Mongoceras is an extinct orthoconic nautiloid cephalopod found in the Silurian of China and Siberia. It is included in the Orthocerida. The family in undetermined...
- Late Silurian. Their s**** were variable in form. Some were straight (orthoconic), others curved (cyrtoconic); some were long (longiconic), others short...
- Ordovician to the Devonian. The s**** is usually long, and may be straight ("orthoconic") or gently curved. In life, these animals may have been similar to the...