What is "ovaticeras"

Ovaticeras is an extinct genus of cephalopod belonging to the family Hildoceratidae. These cephalopods existed in the Jurassic period, during upper Pliensbachian and lower Toarcian. Its fossils were found in Europe, North Africa and possibly also in Canada and Vietnam. It might have evolved from Harpoceras falciferum (in the case of species O. ovatum, as O. paltoides lived before Harpoceras falciferum) and died out without leaving any descendants.