Hildoceras

Hildoceras
Temporal range: Toarcian[1]
Hildoceras sp.
Scientific classification Edit this classification
Domain: Eukaryota
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.

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

Distribution

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

Species

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  • 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

References

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Notes
  1. ^ a b Sepkoski, Jack (2002). "Sepkoski's Online Genus Database". Retrieved 2014-05-28.
  2. ^ "Paleobiology Database - Hildoceras". Retrieved 17 December 2021.[permanent dead link]
  3. ^ 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.
Bibliography
  • Arkell, W.J.; Kummel, B.; Wright, C.W. (1957). Mesozoic Ammonoidea. Treatise on Invertebrate Paleontology, Part L, Mollusca 4. Lawrence, Kansas: Geological Society of America and University of Kansas Press.