Hildoceratinae

Hildoceratinae; Temporal range: Upper Pliensbachian to upper Toarcian[1] PreꞒ Ꞓ O S D C P T J K Pg N
	Reconstruction of Hildoceras
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	†Ammonoidea
Order:	†Ammonitida
Family:	†Hildoceratidae
Subfamily:	†Hildoceratinae; Hyatt, 1867
Genera
	See text
Synonyms
	Mercaticeratinae Guex, 1973

Hildoceratinae is an extinct subfamily of cephalopods belonging to the family Hildoceratidae. Ammonites of this subfamily had shells with elliptical or quadrate whorl section with keel or tricarinate, bisulcate venter. Ribs were variable, from falcate to strongly angled and from fine to strong. They can be interrupted by spiral groove in midlateral part of the shell. While some species can be smooth, strongly ribbed ones can have tubercules. Microconchs have short lapplets that is in its shape similar to the shape of growth lines in spiral midlateral groove.[1]

Genera

[1][2]

Hildaites Buckman, 1921
Orthildaites Buckman, 1923
Hildoceras Hyatt, 1867
Parahildaites Blaison, 1967
Mercaticeras Buckman, 1913
Hildaitoides Hillebrandt, 1987
Atacamiceras Hillebrandt, 1987
Neolioceratoides Cantaluppi, 1970

Distribution

Members of this subfamily lived from the upper PLiensbachian to upper Toarcian stages of early Jurassic. Distribution has been worldwide.[1][2]

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References

M. K. Howarth 2013. Treatise on Invertebrate Paleontology, Part L, Revised, Volume 3B, Chapter 4: Psiloceratoidea, Eoderoceratoidea, Hildoceratoidea.
Bardin, J., Rouget, I., & Cecca, F. (2016). The phylogeny of Hildoceratidae (Cephalopoda, Ammonitida) resolved by an integrated coding scheme of the conch. Cladistics.

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

[Bardin2016-2] Bardin, J., Rouget, I., & Cecca, F. (2016). The phylogeny of Hildoceratidae (Cephalopoda, Ammonitida) resolved by an integrated coding scheme of the conch. Cladistics.