411 REFERENCE · Wiktionary
Echioceratidae
Reference material by Wiktionary contributors. This retains its source identity and is not 411 news reporting.
Translingual
thumb|Echioceras raricostatum species
Etymology
Echioceras genus mul idae
Proper noun
†
family order Ammonitida order ammonites with serpenticone shells with keel, that lived in the Sinemurian stage of the Jurassic
References
Psiloceratoidea
Psiloceratoidea
1