Narthecoceratidae
Introduction '''''Narthecoceratidae''''' is an extinct family of orthocone cephalopods who lived in marine environments in what is now North America during the Ordovician from 460.5—449 mya, existing for approximately .
Taxonomy Narthecoceratidae was named by Flower (1958). It was assigned to ''Endocerida'' by Teichert et al. (1964); and reassigned to ''Orthocerida'' by Frey (1981).
Morphology The shell is usually long, and may be straight ("orthoconic") or gently curved. In life, these animals may have been similar to the modern squid, except for the long shell.
Fossil distribution Fossil distribution includes Ohio, Franklin District, Canada, and Manitoba, Canada.
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