Hildoceras

 ( Ammonitida Genera ) 

Hildoceras is a genus of Ammonitida from the Jurassic 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.

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Distribution Jurassic of Bulgaria, France, Germany, Hungary, Italy, Japan, Luxembourg, Serbia and Montenegro, Spain, the United Kingdom and Iran.Seyed-Emami, Kazem, et al. "Toarcian and Aalenian (Jurassic) ammonites from the Shemshak Formation of the Jajarm area (eastern Alborz, Iran)." Paläontologische Zeitschrift 79.3 (2005): 349-369.

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Species

• Hildoceras ameuri
• Hildoceras apertum
• Hildoceras bifrons
• Hildoceras caterinii
• Hildoceras crassum
• Hildoceras lusitanicum
• Hildoceras semipolitum
• Hildoceras snoussi
• Hildoceras sublevisoni
• Hildoceras tethysi

Notes

Bibliography

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