Prodactylioceras

Prodactylioceras; Temporal range: Pliensbachian PreꞒ Ꞓ O S D C P T J K Pg N [1]
	P. davoei - type species of genus
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	†Ammonoidea
Order:	†Ammonitida
Family:	†Dactylioceratidae
Subfamily:	†Reynesocoeloceratinae
Genus:	†Prodactylioceras; Spath, 1923
Type species
	Ammonites davoei; Sowerby, 1822
Species
	P. davoei Sowerby, 1822; P. nodosissimum Quenstedt, 1885; P. italicum Meneghini et Fucini, 1900; P. colubriforme Bettoni, 1900; P. rectiradiatum Wingrave, 1916; P. aurigeriense Dommergues et al., 1984; P. ausonicum Fucini, 1900; P. westgatenses Caruthers et al., 2018;
Synonyms
	Paralytoceras Frebold, 1922; not Paralytoceras Frech, 1902; Praedactylioceras Frentzen, 1937;

Prodactylioceras is genus of ammonite that lived during the Pliensbachian stage of early Jurassic. It has evolved from Reynesocoeloceras, but maybe not directly, but through Bettoniceras. Its fossils were found in Europe, Asia and North America.[1]

While sometimes, genus Bettoniceras, which differs from Prodactylioceras only by lacking tubercules is considered valid,[1] in other cases it is considered to be a synonym of this genus.[2] Species as P. italicum, or P. colubriforme would not be in that case belonging to this genus, as they are members of genus Bettoniceras.[3]

Description

Ammonites of this genus had evolute shells, with circular to slightly depressed whorl section. In compressed species, ribs were fine and often prorsiradiate and they were wearing ventrolateral tubercules. In depressed species, ribs are coarser and swollen, while ventrolateral tubercules are larger.[1]

References

M. K. Howarth 2013. Treatise on Invertebrate Paleontology, Part L, Revised, Volume 3B, Chapter 4: Psiloceratoidea, Eoderoceratoidea, Hildoceratoidea.
Meister, C., Dommergues, J. L., Dommergues, C., Lachkar, N., & El Hariri, K. (2011). Les ammonites du Pliensbachien du jebel Bou Rharraf (Haut Atlas oriental, Maroc). Geobios, 44(1), 117-e1.
Wiedenmayer, F. (1980). Die Ammoniten Der Mediterranen Provinz Im Pliensbachian Und Unteren Toarcian Aufgrund Neuer Untersuchungen Im Generoso-Becken: Lombardische Alpen (Vol. 93). Birkhauser.

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[Howarth2013-1] M. K. Howarth 2013. Treatise on Invertebrate Paleontology, Part L, Revised, Volume 3B, Chapter 4: Psiloceratoidea, Eoderoceratoidea, Hildoceratoidea.

[Meister2011-2] Meister, C., Dommergues, J. L., Dommergues, C., Lachkar, N., & El Hariri, K. (2011). Les ammonites du Pliensbachien du jebel Bou Rharraf (Haut Atlas oriental, Maroc). Geobios, 44(1), 117-e1.

[Wiedenmayer1980-3] Wiedenmayer, F. (1980). Die Ammoniten Der Mediterranen Provinz Im Pliensbachian Und Unteren Toarcian Aufgrund Neuer Untersuchungen Im Generoso-Becken: Lombardische Alpen (Vol. 93). Birkhauser.