Catacoeloceras

<i>Catacoeloceras</i>

Catacoeloceras

Extinct genus of ammonites

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]

Quick Facts Scientific classification, Type species ...

Description

Life restoration

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


Stub icon

This Ammonitina-related article is a stub. You can help Wikipedia by expanding it.
Share this article:

This article uses material from the Wikipedia article Catacoeloceras, and is written by contributors. Text is available under a CC BY-SA 4.0 International License; additional terms may apply. Images, videos and audio are available under their respective licenses.