Hildoceratoidea

Hildoceratoidea Temporal range: Early—Middle Jurassic, Pliensbachian–Bajocian PreꞒ Ꞓ O S D C P T J K Pg N

Harpoceras exaratum
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	†Ammonoidea
Order:	†Ammonitida
Suborder:	†Ammonitina
Superfamily:	†Hildoceratoidea Hyatt, 1867
Families^[2]
Erycitidae^[1] Hildoceratidae Hammatoceratidae Graphoceratidae Sonniniidae

Hildoceratoidea, formerly Hildoceratacaea, is a superfamily of compressed or planulate ammonites, some tending to develop acute outer rims; generally with arcuate or sigmoidal ribs. Aptichus were found in place are double-valved.^[3]

Hildoceratoidea is an upper Lower to lower Middle Jurassic group belonging to the Ammonitina that unites the Hildoceratidae, Hammatoceratidae, Graphoceratidae, and Sonniniidae.^[3] In some taxonomies the name Phymatoceratidae is substituted for the Hammatoceratidae^[4]

Hildoceratidae, which is the ancestral family, is derived from the Acanthopleuroceratinae, a subfamily in the Eoderoceratoidean family, Polyorphitidae. The Stephanoceratoidea, Perisphinctoidea, and Haploceratoidea have their source in the Hammatoceratidae which is derived from the Hildoceratidae.^[3]

Approximate timeline of Hildoceratoidea families with their evolutionary relationships.

References

^ Kovács, Z.; Géczy, B. (2008). "Upper Toarcian – Middle Aalenian (Jurassic) Erycitinae SPATH (Ammonitina) from the Gerecse Mts, Hungary" (PDF). 125th Anniversary of the Department of Palaeontology at Budapest University – A Jubilee Volume Hantkeniana. 6: 57–108. Archived from the original (PDF) on 2011-07-16. Retrieved 2010-11-25.
^ "Paleobiology Database - Hildoceratoidea". Retrieved 2017-10-19.
^ ^a ^b ^c Arkell et al., Treatise on Invertebrate Paleontology, Part L Ammonoidea, (1956)
^ Taxonomicon (Hildocerataceae)|

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