Holcodiscus
{{Short description|Genus of molluscs (fossil)}}
{{Automatic taxobox
| fossil_range = Cretaceous{{cite web |url= http://strata.geology.wisc.edu/jack/showgenera.php?taxon=231&rank=class |title= Holcodiscus |publisher= Sepkoski's Online Genus Database – Cephalopoda}}{{cite web |title= Holcodiscus |publisher= Paleobiology Database |url= https://paleobiodb.org/classic/basicTaxonInfo?taxon_no=15004}} {{Fossilrange|130.0|84.9}}
| image = Holcodiscidae - Holcodiscus fallax.JPG
| image_caption = Fossil shell of Holcodiscus fallax from Alpes-de-Haute-Provence, on display at Galerie de paléontologie et d'anatomie comparée in Paris
| taxon = Holcodiscus
| authority = Uhlig, 1882
}}
Holcodiscus is an extinct ammonite genus placed in the family Holcodiscidae. Species in this genus were fast-moving nektonic carnivores. The type species of the genus is Ammonites caillaudianus.
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.{{cite book |url =https://www.worldcat.org/oclc/61988855|author = Wright, C. W. with J.H. Callomon and M.K. Howarth |year =1996 |title= Mollusca 4 Revised, Cretaceous Ammonoidea, in Treatise on Invertebrate Paleontology, Part L |editor= Roger L. Kaesler |place= Boulder, Colorado Lawrence, Kansas |publisher= The Geological Society of America & University of Kansas Press| volume= 4| page =48 |oclc =61988855}}
Species
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.
Gallery
File:Holcodiscus mediocostatus Tzankov, 1935, Barremian, Razgrad, Cr1 1716 (Coll. V. Tzankov) at the Sofia University 'St. Kliment Ohridski' Museum of Paleontology and Historical Geology.jpg|Holcodiscus mediocostatus Tzankov, 1935, Barremian, Razgrad, Cr1 1716 (Coll. V. Tzankov) at the Sofia University Museum of Paleontology and Historical Geology
Notes
{{Reflist}}
External links
{{wikimedia}}
- {{cite web |title=Holcodiscus |publisher= mindat.org |url=https://www.mindat.org/taxon-4627553.html |accessdate= 30 December 2021}}
- {{cite web |title=Holcodiscus |publisher=Encyclopedia of Life (EOL) |url=https://eol.org/pages/47420755 |accessdate= 30 December 2021}}
- {{Cite book |last= Wright |first= Claud William; with John Hannes Callomon and M.K. Howarth |year=1996 |title= Mollusca 4 Revised, Cretaceous Ammonoidea in Treatise on Invertebrate Paleontology Part L |editor = Roger L. Kaesler |publisher= The Geological Society of America & University of Kansas Press|place= Boulder, Colorado and Lawrence, Kansas |url=https://archive.org/details/treatiseoninvert0000join/page/n3/mode/2up?view=theater |url-access= registration |page=[https://archive.org/details/treatiseoninvert0000join/page/48/mode/2up?view=theater 48]}}
- {{cite book |author1= Arkell, W. J. |author2= Furnish, W. M. |author3= Kummel, Bernhard |author4= Miller, A.K. |author5= Moore, R.C. |author6= Schindewolf, O.H. |year= 1957 |chapter= Part L, Mollusca 4: Cephalopoda, Ammonoidea |title= Treatise on Invertebrate Paleontology |publisher= Geological Society of America and University of Kansas Press |editor= Raymond C. Moore |editor-link= Raymond Cecil Moore |url= https://archive.org/details/treatiseoninvert0000unse_n4o3/page/n3/mode/2up?view=theater |url-access= registration |page= [https://archive.org/details/treatiseoninvert0000unse_n4o3/page/370/mode/2up?view=theater L371] |isbn= 978-0-8137-3012-7 |via= Internet Archive}}
{{Taxonbar|from=Q12259217}}
Category:Early Cretaceous genus first appearances
Category:Santonian genus extinctions
Category:Fossils of Georgia (country)
Category:Ammonites of North America
Category:Fossils of the United States
Category:Ammonites of South America
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