Hildoceras Explained

Hildoceras is a genus of ammonite 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.

Distribution

Jurassic of Bulgaria, France, Germany, Hungary, Italy, Japan, Luxembourg, Serbia and Montenegro, Spain, the United Kingdom and Iran.^{[1] [2]}

Species

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

References

Notes

Bibliography

• Book: W.J. . Arkell . B. . Kummel . C.W. . Wright . Treatise on Invertebrate Paleontology, Part L, Mollusca 4. Mesozoic Ammonoidea . Geological Society of America and University of Kansas Press . Lawrence, Kansas. 1957.

Notes and References

1. Web site: Paleobiology Database - Hildoceras . 17 December 2021 .
2. 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.