Spitidiscus

Spitidiscus Temporal range: Hauterivian-Barremian ~130–125 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Fossil shell of Spitidiscus species from Alpes-de-Haute-Provence, on display at Galerie de paléontologie et d'anatomie comparée in Paris
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Order:	Ammonitida
Family:	Holcodiscidae
Genus:	Spitidiscus Kilian, 1910

Spitidiscus is a genus of ammonites placed in the family Holcodiscidae.^[1]

Species[]

List of species within Spitidiscus:^[2]

• S. hugii^{[citation needed]}
• S. kilapiae Rawson and Aguirre-Urreta, 2012 - Argentina
• S. oregonensis Imlay, 1960 - Oregon
• S. riccardii Leanza, and Wiedmann, 1992 - Argentina
• S. rotulia - England^{[citation needed]}
• S. simitiensis Haas, 1960 - Colombia
• S. vandeckii (d'Orbigny, 1847)

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. The type species S. rotulia is from the Hauterivian of England.^{[citation needed]}

Biostratigraphic significance[]

The first appearance of the species or are proposed to be the marker for the beginning of the Barremian.^[3]

Distribution[]

Spitidiscus has been found in:^[2]

• Agrio Formation, Argentina
• Magdalena Valley, Simití and Cáqueza, Colombia
• , Czech Republic
• France
• Gagra, Georgia, Caucasus
• , Italy
• , Spain
• , Oregon
• Bulgaria^{[citation needed]}
• Portugal^{[citation needed]}
• Russia^{[citation needed]}
• Morocco^{[citation needed]}
• Mexico^{[citation needed]}

References[]

Bibliography[]

• W.J. Arkell et al., (1957). Mesozoic Ammonoidea in Treatise on Invertebrate Paleontology, Part L, Ammonoidea. Geological Society of America and Univ Kansas Press.

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