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. Whorls slightly overlap, cross sections are compressed. The ventral keel is bordered on either side by a shallow groove. The genus was named by Alpheus Hyatt after Saint Hilda in 1876.

Hildoceras sp. morphological and external structural characteristics

Hildoceras Temporal range: Toarcian[1] PreꞒ Ꞓ O S D C P T J K Pg N
Hildoceras sp.
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	†Ammonoidea
Order:	†Ammonitida
Family:	†Hildoceratidae
Subfamily:	†Hildoceratinae
Genus:	†Hildoceras Hyatt, 1876
Species
See text

Recreation of Hildoceras

Hildoceras species from the Toarcian Bifrons Zone of the Gerecse Mts, Hungary. Collection Eötvös University, Dep. Palaeontology, Budapest.

Distribution

Jurassic of Bulgaria, France, Germany, Hungary, Italy, Japan, Luxembourg, Serbia and Montenegro, Spain, the United Kingdom and Iran.^[2][3]

Species

• Hildoceras ameuri Rulleau, Elmi & Thevenard, 2001
• Hildoceras apertum Gabilly, 1976
• Hildoceras bifrons (Bruguière, 1789)
• Hildoceras caterinii Merla, 1932
• Hildoceras crassum Mitzopoulos, 1930
• Hildoceras lusitanicum Meister, 1913
• Hildoceras semipolitum Buckman, 1902
• Hildoceras snoussi Elmi, 1977
• Hildoceras sublevisoni Fucini, 1919
• Hildoceras tethysi Géczy, 1967