Engonoceratidae
Derivation from the Hoplitidae seems more likely , from something like "Cleoniceras" or "Aioloceras" by simplification and evening out of the suture . 
<triplet> Cleoniceras <subj> Hoplitidae <obj> parent taxon <triplet> Aioloceras <subj> Hoplitidae <obj> parent taxon