Catacoeloceras
Temporal range: [1]
Catacoeloceras dumortieri.
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Subclass: Ammonoidea
Order: Ammonitida
Family: Dactylioceratidae
Subfamily: Dactylioceratinae
Genus: Catacoeloceras
Hyatt, 1867
Type species
Catacoeloceras confectum
Buckman, 1923
Species
  • C. confectum Buckman, 1923
  • C. dumortieri de Brun, 1932
  • C. raquinianum d'Orbigny, 1844
  • C. crassum Young & Bird, 1828
  • C. engeli Monestier, 1931
  • C. jordani Guex, 1972
  • C. becaudi Rulleau & Lacroix, 2013
  • C. densicostatum (Schmidt-Effing, 1972)
  • C. puteolum (Simpson, 1855)
  • ?C. manifestum (Dagis, 1967)
  • ?C. proprium (Dagis, 1967)
  • ?C. prinzi (Géczy, 1967)
  • ?C. grangei Stevens, 2008
Synonyms
  • Omolonoceras Dagis, 1967

Catacoeloceras is a genus of ammonite that lived during Middle Toarcian stage of early Jurassic. Members of this genus existed from Bifrons Subzone of Bifrons Zone to Variabilis Zone. Their fossils were found in Europe, northern Africa, Asia, North America and South America.[1] It has evolved from Porpoceras.[2]

Description

Ammonites belonging to this genus have cadicone shells with depressed, rounded whorl section. Some species have almost spheroconic shells and these ones were designated as genus Transicoeloceras, which is considered to be a synonym of Catacoeloceras by some authors, while sometimes it is considered to be a valid genus. Ribs can be both simple or bifurcating. In the case of most of the species, ventrolateral tubercules are present. On body chamber, between tubercules, venter can be smooth and flat. Before mouth border, there is constriction. Size dimorphism is present in this genus. Genus Mucrodactylites is considered to be a microconch.[1][2]

References

  1. 1 2 3 M. K. Howarth 2013. Treatise on Invertebrate Paleontology, Part L, Revised, Volume 3B, Chapter 4: Psiloceratoidea, Eoderoceratoidea, Hildoceratoidea.
  2. 1 2 Kovács, Z. (2014). Toarcian Dactylioceratidae (Ammonitina) from the Gerecse Mts (Hungary). Hantkeniana, 9, 45-77.


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