Holcodiscidae

Holcodiscidae is an ammonite family placed in the Ammonite superfamily Desmoceratoidea.[1][2]

Holcodiscidae Temporal range: Cretaceous PreꞒ Ꞓ O S D C P T J K Pg N
Spitidiscus species from Alpes-de-Haute-Provence
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	†Ammonoidea
Order:	†Ammonitida
Superfamily:	†Desmoceratoidea
Family:	†Holcodiscidae Spath, 1923
Synonyms
Astieridiscidae Tzankov & Breskovski, 1982; Metahoplidae Tzankov & Breskovski, 1982

Description

Moderately involute with rounded, rectangular, or depressed whorl section; straight or sinuous, fine, dense ribs typically continuing over venter and may be periodically truncated by oblique, enlarged ribs, with or without umbilical, lateral and ventrolateral tubercles. Suture rather simple.[2][3]

Genera

• Astieridiscus
• Holcodiscus
• Jeanthieuloyites
• Parasaynoceras
• Spitidiscus

Distribution

Fossils of species within this family have been found in the Cretaceous sediments in Argentina, Austria, Bulgaria, Chile, Colombia, the Czech Republic, Czechoslovakia, France, Hungary, Italy, Mexico, Morocco, Portugal, Romania, Slovakia, Spain and Russia.[1][2]

References

1. The Paleobiology Database
2. Wright, C. W. with J.H. Callomon and M.K. Howarth (1996), Mollusca 4 Revised, Cretaceous Ammonoidea, vol. 4, in Treatise on Invertebrate Paleontology, Part L (Roger L. Kaesler et el. eds.), Boulder, Colorado: The Geological Society of America & Lawrence, Kansas: University of Kansas Press, p.48.
3. Tzankov, V. & Breskovski, S. (1982), "Volume et contenu de la famille Holcodiscidae Spath, 1924," C.R. Acad. bulg. Sci., 35, 4, 491-93.

• Arkell, W. J. et al., (1957). Mesozoic Ammonoidea in Treatise on Invertebrate Paleontology, Part L, Ammonoidea. Geological Society of America and Univ Kansas Press.