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]
| Holcodiscus | |
|---|---|
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| Fossil shell of Holcodiscus fallax from Alpes-de-Haute-Provence, on display at Galerie de paléontologie et d'anatomie comparée in Paris | |
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Cephalopoda |
| Subclass: | †Ammonoidea |
| Order: | †Ammonitida |
| Family: | †Holcodiscidae |
| Genus: | †Holcodiscus Uhlig 1882 |
Description
editCircular 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
editSource:[2]
- Holcodiscus caillaudianus d'Orbigny 1850
- Holcodiscus camelinus d'Orbigny 1850
- Holcodiscus hauthali Paulcke 1907
- Holcodiscus tenuistriatus Paulcke 1907
Distribution
editFossils 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]
Gallery
edit-
Holcodiscus mediocostatus Tzankov, 1935, Barremian, Razgrad, Cr1 1716 (Coll. V. Tzankov) at the Sofia University Museum of Paleontology and Historical Geology
_at_the_Sofia_University_%27St._Kliment_Ohridski%27_Museum_of_Paleontology_and_Historical_Geology.jpg)
Notes
edit- ^ "Holcodiscus". Sepkoski's Online Genus Database – Cephalopoda.
- ^ a b c d e "Holcodiscus". Paleobiology Database.
- ^ 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.
External links
edit
Definitions from Wiktionary
Media from Commons
News from Wikinews
Quotations from Wikiquote
Texts from Wikisource
Textbooks from Wikibooks
Resources from Wikiversity
- "Holcodiscus". mindat.org. Retrieved 30 December 2021.
- "Holcodiscus". Encyclopedia of Life (EOL). Retrieved 30 December 2021.
- Wright, Claud William; with John Hannes Callomon and M.K. Howarth (1996). Roger L. Kaesler (ed.). Mollusca 4 Revised, Cretaceous Ammonoidea in Treatise on Invertebrate Paleontology Part L. Boulder, Colorado and Lawrence, Kansas: The Geological Society of America & University of Kansas Press. p. 48.
{{cite book}}: CS1 maint: multiple names: authors list (link) - Arkell, W. J.; Furnish, W. M.; Kummel, Bernhard; Miller, A.K.; Moore, R.C.; Schindewolf, O.H. (1957). "Part L, Mollusca 4: Cephalopoda, Ammonoidea". In Raymond C. Moore (ed.). Treatise on Invertebrate Paleontology. Geological Society of America and University of Kansas Press. p. L371. ISBN 978-0-8137-3012-7 – via Internet Archive.
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