Holcodiscus

Holcodiscus; Temporal range: Cretaceous 130.0–84.9 Ma PreꞒ Ꞓ O S D C P T J K Pg N
	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

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[edit]

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[edit]

Source:^[2]

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

Distribution[edit]

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]

Gallery[edit]

Holcodiscus mediocostatus Tzankov, 1935, Barremian, Razgrad, Cr1 1716 (Coll. V. Tzankov) at the Sofia University Museum of Paleontology and Historical Geology

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]

"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 – via Internet Archive.

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[fb-1] "Holcodiscus". Sepkoski's Online Genus Database – Cephalopoda.

[fa-2] "Holcodiscus". Paleobiology Database.

[wright-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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