The subfamily Nodicoeloceratinae comprises early Jurassic

ammonite Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are more closely related to living coleoids (i.e., octopuses, squid and cuttlefish) ...

genera that lived during early to middle

Toarcian The Toarcian is, in the ICS' geologic timescale, an age and stage in the Early or Lower Jurassic. It spans the time between 182.7 Ma (million years ago) and 174.1 Ma. It follows the Pliensbachian and is followed by the Aalenian. The Toarcian ...

stage. Origin of this subfamily is unknown, but first genus ''

Nodicoeloceras ''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 Eu ...

'' has evolved from '' Dactylioceras (Orthodactylites)'' or '' Kedonoceras''.

Validity

Sometimes, this taxon is considered to be invalid and is included in

Dactylioceratinae The subfamily Dactylioceratinae comprises early Jurassic ammonite genera that lived during Upper Pliensbachian to Upper Toarcian stage. These dactylioceratids existed from Margaritatus ammonite Zone, when they have evolved from Reynesocoeloc ...

. This is not so in the case of scientists that describe Mediterranean faunal province that values phylogenetic, morphological and paleobiogeographical importance of this subfamily.M. K. Howarth (2013). Treatise on Invertebrate Paleontology, Part L, Revised, Volume 3B, Chapter 4: Psiloceratoidea, Eoderoceratoidea, Hildoceratoidea.

Taxonomy

Following genera are members of this subfamily: *''

'' Buckman, 1926 *''

Mesodactylites ''Mesodactylites'', which is sometimes considered to be a synonym of '' Nodicoeloceras''M. K. Howarth 2013. Treatise on Invertebrate Paleontology, Part L, Revised, Volume 3B, Chapter 4: Psiloceratoidea, Eoderoceratoidea, Hildoceratoidea. is genus ...

'' Pinna et Levi-Setti, 1971 *''

Transicoeloceras ''Transicoeloceras'', which is sometimes considered to be a synonym of ''Catacoeloceras''M. K. Howarth 2013. Treatise on Invertebrate Paleontology, Part L, Revised, Volume 3B, Chapter 4: Psiloceratoidea, Eoderoceratoidea, Hildoceratoidea. is genu ...

'' Pinna, 1966 *'' Telodactylites'' Pinna et Levi-Setti, 1971 *'' Collina'' Bonarelli, 1893

References

Ammonitida Toarcian life Toarcian first appearances Toarcian extinctions {{ammonite-stub