Holcodiscus

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Holcodiscus
Temporal range: Cretaceous[1][2] 130.0–84.9 Ma
File: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 Edit this classification
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]

Description

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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

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Source:[2]

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

Distribution

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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]

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Notes

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