Definition of Orthocerid. Meaning of Orthocerid. Synonyms of Orthocerid

- Eocene fossil Antarcticeras is sometimes considered a descendant of the orthocerids although this is disputed. They were most common however from the Ordovician...
- rock-forming, as do certain other extinct, straight-s****ed cephalopods (e.g., orthocerid nautiloids). Studies on exceptionally preserved specimens have revealed...
- possibly orthocerids. The last straight-s****ed forms were long thought to have disappeared at the end of the Tri****ic, but a possible orthocerid has been...
- famous finds are trilobites and the nautiloid cephalopod including the orthocerid order of extinct Silurian-Devonian orthoceratoid cephalopods. Nautiloid...
- subsequently split off as separate order. Order † Orthocerida Includes orthocerids and pseudorthocerids Order † Ascocerida Order † Oncocerida Order † Discosorida...
- Treptoceras is a fossil cephalopod genus included in the orthocerid family Proteoceratidae. It has been found in Ordovician rocks dated from about 460...
- These polished orthocerid nautiloid cephalopod fossils from Morocco have fully preserved septal necks and connecting rings outlining the shape of the siphuncle...
- of North America. It has either been interpreted as arm traces of an orthocerid cephalopod or interconnected burrows of an unknown animal. Osgood, R.G...
- uppermost Lower Ordovician of western North America, belonging to the Orthocerid family Troedssonellidae. The s**** of Tajaroceras is smooth and straight...
- Rioceras is an extinct genus of orthocerid cephalopods of the family Baltoceratidae that lived in what would be North America during the Early Ordovician...