''Nodicoeloceras'' is genus of
ammonite
Ammonoids are extinct, (typically) coiled-shelled cephalopods comprising the subclass Ammonoidea. They are more closely related to living octopuses, squid, and cuttlefish (which comprise the clade Coleoidea) than they are to nautiluses (family N ...
that lived during early to middle
Toarcian
The Toarcian is, in the International Commission on Stratigraphy, ICS' geologic timescale, an age (geology), age and stage (stratigraphy), stage in the Early Jurassic, Early or Lower Jurassic. It spans the time between 184.2 Megaannum, Ma (million ...
stage of
early Jurassic
The Early Jurassic Epoch (geology), Epoch (in chronostratigraphy corresponding to the Lower Jurassic series (stratigraphy), Series) is the earliest of three epochs of the Jurassic Period. The Early Jurassic starts immediately after the Triassicâ ...
. 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.
It has probably evolved from ''
Dactylioceras (Orthodactylites)'' or ''
Kedonoceras'' and gave rise to ''
Mesodactylites''.
[
]
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.[Kovács, Z. (2014). Toarcian Dactylioceratidae (Ammonitina) from the Gerecse Mts (Hungary). Hantkeniana, 9, 45-77.]
Synonyms
While '' Mesodactylites'' and '' Fibulocoeloceras'' are sometimes considered to be just synonyms of ''Nodicoeloceras'',[
]
References
Dactylioceratidae
Toarcian life
Early Jurassic ammonites of Europe
Ammonites of Africa
Ammonites of Asia
Ammonites of North America
Ammonites of South America
Ammonitida genera
{{Ammonitina-stub