Hildoceras

Hildoceras is a genus of ammonite from the Jurassic[1] period in the family Hildoceratidae.

The shells are characterized by a narrow discoidal evolute shape, keeled venter, concave ribs along the outer flanks, and a shallow spiral groove running along smooth inner flanks.

The ventral keel is bordered on either side by a shallow groove.

The genus was named by Alpheus Hyatt after Saint Hilda in 1876.

Jurassic of Bulgaria, France, Germany, Hungary, Italy, Japan, Luxembourg, Serbia and Montenegro, Spain, the United Kingdom and Iran.

Recreation of Hildoceras
Hildoceras species from the Toarcian Bifrons Zone of the Gerecse Mts, Hungary. Collection Eötvös University, Dep. Palaeontology, Budapest.
Hildoceras sp morphological and external structural characteristics