Extinct genus of ammonites
Nodicoeloceras
Temporal range: Toarcian [1] |
Scientific classification 
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| Domain:
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Eukaryota
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| Kingdom:
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Animalia
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| Phylum:
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Mollusca
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| Class:
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Cephalopoda
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| Subclass:
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†Ammonoidea
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| Order:
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†Ammonitida
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| Family:
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†Dactylioceratidae
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| Subfamily:
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†Dactylioceratinae
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| Genus:
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†Nodicoeloceras
Buckman, 1923
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| Type species
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Ammonites crassoides
Simpson, 1855
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| Species
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- N. angelonii Ramaccioni, 1939
- N. choffati Renz, 1912
- N. crassoides Simpson, 1855
- N. crateriforme Monestier in Guex, 1972
- N. dayi Reynes, 1868
- N. dulaii Kovács, 2014
- N. fontis Guex, 1972
- N. lobatum Buckman, 1927
- N. middlegatense Caruthers et al., 2018
- N. nevadaense Caruthers et al., 2018
- N. tuberculatum Kottek, 1966
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| Synonyms
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- Crassicoeloceras Buckman, 1926
- Lobodactylites Buckman, 1926
- Multicoeloceras Buckman, 1926
- Spinicoeloceras Buckman, 1926
- Mesodactylites Pinna & Levi-Setti, 1971
- Fibulocoeloceras Venturi & Ferri, 2001
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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
- ^ a b c d M. K. Howarth 2013. Treatise on Invertebrate Paleontology, Part L, Revised, Volume 3B, Chapter 4: Psiloceratoidea, Eoderoceratoidea, Hildoceratoidea.
- ^ a b c Kovács, Z. (2014). Toarcian Dactylioceratidae (Ammonitina) from the Gerecse Mts (Hungary). Hantkeniana, 9, 45-77.
