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 OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Subclass: Ammonoidea
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]

Contents

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

Source: [2]

Distribution

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

Notes

  1. "Holcodiscus". Sepkoski's Online Genus Database – Cephalopoda.
  2. 1 2 3 4 5 "Holcodiscus". Paleobiology Database.
  3. Wright, C. W. with J.H. Callomon and M.K. Howarth (1996). Roger L. Kaesler (ed.). Mollusca 4 Revised, Cretaceous Ammonoidea, in Treatise on Invertebrate Paleontology, Part L. Vol. 4. Boulder, Colorado Lawrence, Kansas: The Geological Society of America & University of Kansas Press. p. 48. OCLC   61988855.


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