Nodicoeloceras

Nodicoeloceras
Temporal range: Toarcian

[1]

Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Subclass: †Ammonoidea
Order: †Ammonitida
Family: †Dactylioceratidae
Subfamily: †Dactylioceratinae
Genus: †Nodicoeloceras
Buckman, 1923
Type species
Ammonites crassoides
Simpson, 1855
Species
  • N. crassoides Simpson, 1855
  • N. choffati Renz, 1912
  • N. tuberculatum Kottek, 1966
  • N. angelonii Ramaccioni, 1939
  • N. dulaii Kovács, 2014
Synonyms
  • Crassicoeloceras Buckman, 1926
  • Lobodactylites Buckman, 1926
  • Multicoeloceras Buckman, 1926
  • Spinicoeloceras Buckman, 1926
  • Mesodactylites Pinna & Levi-Setti, 1971
  • Fibulocoeloceras Venturi & Ferri, 2001

Nodicoeloceras is genus of ammonite that lived during early to middle Toarcian stage of early Jurassic. Members of this genus existed from Exaratum Subzone of Falciferum Zone to Commune subzone of Bifrons Zone. Their fossils were found in Europe, northern Africa, Asia, North America and South America.[1] It has probably evolved from Dactylioceras (Orthodactylites) or Kedonoceras and gave rise to Mesodactylites.[2]

Description

Ammonites belonging to this genus have moderately evolute to cadicone shells. Whorl section is characterized by depressed whorls with convex flanks and low venter. Ribs are bifurcating at the position of ventrolateral shoulder, where tubercules, or spines are mostly present.[1][2]

Synonyms

While Mesodactylites and Fibulocoeloceras are sometimes considered to be just synonyms of Nodicoeloceras,[1] other times they are considered to be a valid genera.[2]

References

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


This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.