Holcodiscus

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Holcodiscus
Temporal range: Cretaceous[1][2] 130.0–84.9 Ma
Holcodiscidae - Holcodiscus fallax.JPG
Fossil shell of Holcodiscus fallax 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:
Holcodiscus

Uhlig 1882

Holcodiscus is an extinct ammonite genus placed in the family Holcodiscidae. Species in this genus were fast-moving nektonic carnivores.[2] The type species of the genus is Ammonites caillaudianus.[2]

Description[]

Circular to rectangular whorl section; fine, low, straight or flexuous simple or branched ribs, periodically truncated by thin, high, enlarged ribs bearing lateral and ventrolateral tubercles; inner whorls tending to have depressed whorl section and to resemble Olcostephanus.[3]

Species [2][]

  • Holcodiscus caillaudianus d'Orbigny 1850
  • Holcodiscus camelinus d'Orbigny 1850
  • Holcodiscus hauthali Paulcke 1907
  • Holcodiscus tenuistriatus Paulcke 1907

Distribution[]

Fossils of species within this genus have been found in the Cretaceous sediments of Austria, Bulgaria, Chile, Colombia, Czech Republic, Czechoslovakia, France, Italy, Morocco, Spain and Russia.[2]

Notes[]

  1. ^ Sepkoski, Jack Sepkoski's Online Genus Database – Cephalopoda
  2. ^ a b c d e "Holcodiscus". Paleobiology Database.
  3. ^ Wright, C. W. with J.H. Callomon and M.K. Howarth (1996), Mollusca 4 Revised, Cretaceous Ammonoidea, vol. 4, in Treatise on Invertebrate Paleontology, Part L (Roger L. Kaesler et el. eds.), Boulder, Colorado: The Geological Society of America & Lawrence, Kansas: University of Kansas Press, p.48.

References[]

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

External links[]


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