Echioceratidae
Translingual
Echioceras raricostatum
Etymology
Echioceras + -idae
Proper noun
†Echioceratidae
- A taxonomic family within the order Ammonitida – ammonites with serpenticone shells with keel, that lived in the Sinemurian stage of the Jurassic.
References
Echioceratidae on Wikipedia.Wikipedia 
Psiloceratoidea on Wikispecies.Wikispecies 
Psiloceratoidea on Wikimedia Commons.Wikimedia Commons - Echioceratidae at Paleology Database