Spitidiscus
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| Fossil shell of Spitidiscus species from Alpes-de-Haute-Provence, on display at Galerie de paléontologie et d'anatomie comparée in Paris | |
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| Genus: | Spitidiscus Kilian, 1910
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Spitidiscus is a genus of ammonites placed in the family Holcodiscidae.
Species
List of species within Spitidiscus:[2]
- Spitidiscus hugii[citation needed]
- Spitidiscus kilapiae Rawson and Aguirre-Urreta, 2012 - Argentina
- Spitidiscus oregonensis Imlay, 1960 - Oregon
- Spitidiscus riccardii Leanza, and Wiedmann, 1992 - Argentina
- Spitidiscus rotulia - England[citation needed]
- Spitidiscus simitiensis Haas, 1960 - Colombia
- Spitidiscus vandeckii[citation needed]
Description
Member species have a rather evolute shell in which the whorl section is more or less circular, venter broadly rounded and dorsum fairly deeply impressed. Close, fine low, single or rarely branching ribs are interspersed by frequent straight or slightly sinuous, moderately deep but wide constrictions.
Geologic Time Scale
The first appearance of the species Spitidiscus hugii or Spitidiscus vandeckii are proposed to be the marker for the beginning of the Barremian.[3]
Distribution
Spitidiscus has been found in the Lower Cretaceous of Europe (Bulgaria, Czechoslovakia, France, Italy, Portugal, Spain, Russia), as well as of Morocco, Argentina, Colombia and Mexico.[2] The type species S. rotulia is from the Hauterivian of England.[citation needed]
Notes
- ^ Sepkoski, Jack Sepkoski's Online Genus Database – Cephalopoda
- ^ a b Spitidiscus at Fossilworks.org
- ^ "GSSP Table - Mesozoic Era". Geologic Time Scale Foundation. Retrieved 15 January 2014.
References
- W.J. Arkell et al., (1957). Mesozoic Ammonoidea in Treatise on Invertebrate Paleontology, Part L, Ammonoidea. Geological Society of America and Univ Kansas Press.