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Porpoceras; Temporal range: Toarcian PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	†Ammonoidea
Order:	†Ammonitida
Family:	†Dactylioceratidae
Subfamily:	†Dactylioceratinae
Genus:	†Porpoceras; Buckman, 1911
Type species
	Ammonites vortex; Simpson, 1855
Species
	P. vortex (Simpson, 1855); P. verticosum (Simpson, 1855); P. vorticellum (Simpson, 1855); P. polare Frebold, 1929; P. spinatum Frebold, 1958; P. gigas Guex, 1973; P. planiventer Guex, 1972; P. pseudodesplacei Guex, 1972; P. crassicostatum Guex, 1972; P. beurleni Monestier, 1931; P. tenellissimum Monestier, 1931; P. acanthopsis (D'Orbigny, 1850);
Synonyms
	Telodactylites Pinna & Levi-Setti, 1971; Platystrophites Levi-Setti & Pinna, 1971;

Porpoceras is genus of ammonite that lived during the early and middle Toarcian stage of early Jurassic. Members of this genus existed from uppermost part of the Harpoceras serpentinum zone to the Haugia variabilis zone.^[2] Their fossils were found in Europe, Asia, North America and South America.^[1]

Description

Ammonites belonging to this genus have evolute shells, with compressed to depressed whorl section. Flanks were slightly convex and venter has been low. Whorl section is subrectangular. Prorsiradiate ribs are strong and fibulate on inner whorls and tuberculate to spined on the place of ventrolateral shoulder.^[3] It differs from Peronoceras by not having compressed whorl section and regular fibulation. Catacoeloceras is also similar, but it has regular ventrolateral tubercules and is missing fibulation.^[1]

References

^ ^a ^b ^c M. K. Howarth 2013. Treatise on Invertebrate Paleontology, Part L, Revised, Volume 3B, Chapter 4: Psiloceratoidea, Eoderoceratoidea, Hildoceratoidea.
^ Jattiot, R., Fara, E., Brayard, A., & Vennin, E. (2016). Revised stratigraphic range of the Toarcian ammonite genus Porpoceras Buckman, 1911. Geodiversitas, 38(4), 505-513.
^ KOVÁCS, Z. (2014). Toarcian Dactylioceratidae (Ammonitina) from the Gerecse Mts (Hungary). Hantkeniana, 9, 45-77.

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

[Jattiot2016-2] Jattiot, R., Fara, E., Brayard, A., & Vennin, E. (2016). Revised stratigraphic range of the Toarcian ammonite genus Porpoceras Buckman, 1911. Geodiversitas, 38(4), 505-513.

[Kovacs2014-3] KOVÁCS, Z. (2014). Toarcian Dactylioceratidae (Ammonitina) from the Gerecse Mts (Hungary). Hantkeniana, 9, 45-77.

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