Hildoceratidae

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Hildoceratidae
Temporal range: Pliensbachian to Toarcian 189.600–175.6Ma
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Subclass: †Ammonoidea
Order: †Ammonitida
Superfamily: †Hildoceratoidea
Family: †Hildoceratidae
Hyatt, 1867
Subfamilies
  • Arieticeratinae
  • Bouleiceratinae
  • Grammoceratinae
  • Harpocertinae
  • Hidoceratinae
  • Tmetoceratinae
  • ?Leioceratinae

Hildoceratidae is a family of ammonoid cephalopods from the Lower Jurassic, Pliensbachian to Toarcian stages, generally with strongly ribbed, involute shells. They are combined with the Hammatoceratidae (= Phymatoceratidae), Graphoceratidae, and Sonniniidae to make up the Hildoceratoidea.

As many as seven subfamilies have been included, principle being the Arieticeratinae, Harpocertinae, Hildoceratinae, to which the Treatise, Part L, adds the Bouleiceratinae, Grammoceratinae, and Tmetoceratinae. Donovan et al. (1981) includes the same and adds the Leioceratinae which the older Treatise includes in the Graphoceratidae.

The Hildoceratidae are derived from the Polymorphitidae, a family in the Eoderocerataceae, and gave rise to the Hammatoceratidae and Graphoceratidae.

References

  • Arkell, W.J.; Kummel, B.; Wright, C.W. (1957). Mesozoic Ammonoidea. Treatise on Invertebrate Paleontology, Part L, Mollusca 4. Lawrence, Kansas: Geological Society of America and University of Kansas Press. 
  • Donovan, D.T., Callomon, and Howarth, 1981. Classification of the Jurassic Ammonitina, in The Ammonoidea, Systematics Association special volume 18.
  • Hildoceratidae-Paleodb


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