Orthoceratida
Sign in to saveOrthocerida, from Ancient Greek ὀρθός (orthós), meaning "straight", and κέρας (kéras), meaning "horn", also known as the Michelinocerida, is an order of extinct orthoceratoid cephalopods that lived from the Early Ordovician () possibly to the Late Triassic (). The Eocene fossil Antarcticeras is sometimes considered a descendant of the orthocerids although this is disputed. They were most common however from the Ordovician to the Devonian.
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Encyclopedic overview
6 sectionsContents
- Shell form
- Ecology
- Taxonomy
- Evolutionary history
- References
- External links
Orthocerida, from Ancient Greek ὀρθός (orthós), meaning "straight", and κέρας (kéras), meaning "horn", also known as the Michelinocerida, is an order of extinct orthoceratoid cephalopods that lived from the Early Ordovician () possibly to the Late Triassic (). The Eocene fossil Antarcticeras is sometimes considered a descendant of the orthocerids although this is disputed. They were most common however from the Ordovician to the Devonian.
A fossil found in the Caucasus was previously assigned to Orthocerida, extending the range to the Early Cretaceous, but has since been reassigned to the order Mixosiphonata.
Excerpted from Wikipedia’s “Orthoceratida” article, available under the CC BY-SA 4.0 licence.