Haploceratoidea

Haploceratoidea; Temporal range: Bajocian–Albian PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	†Ammonoidea
Order:	†Ammonitida
Suborder:	†Ammonitina
Superfamily:	†Haploceratoidea; Zittel, 1884
Families
	see text

Haploceratoidea, formerly Haplocerataceae, is a superfamily of ammonoid cephalopods belonging to the Ammonitida that unites three families, Strigoceratidae, Oppeliidae, and Haploceratidae, listed below.

Haploceratoidea begins with all three families in the lower Middle Jurassic, Bajocian. Strigoceratidae is limited to the Bajocian but Oppeliidae, and Haploceratidae extend through the remaining Jurassic, well into the Cretaceous; the Oppeliidae into the middle Albian, the Haplocertidae only into the Valanginian.

Diagnosis[]

Haploceratoidea are typically compressed, discoidal Ammontida that may be keeled or unkeeled, tending to be oxyconic, with usually falcoid or falcate ribbing. The aptychi are paired and differ between families and have been found in situ in e.g. Oppelia subrudiata and in .

Taxonomy[]

The Origin of the Haploceratoidea is undetermined but it is likely all three component families have their beginnings in the Hammatoceratidae in the middle Bajocian. None of the Haploceratoidea is thought to have given rise to any subsequent group.

Superfamily Haploceratoidea Zittel, 1884

Family Haploceratidae Zittel, 1884
- Genus Lissoceras Bayle, 1879
- Genus Glochiceras Hyatt, 1900
- Genus Haploceras Zittel, 1870
- Genus Neolissoceras Spath, 1923
Family Oppeliidae Bonarelli, 1894
- Subfamily (Spath, 1923)
  - Genus Aconeceras Hyatt, 1903
  - Genus Whitehouse, 1927
  - Genus Riccardi et al., 1987
  - Genus
- Subfamily Hecticoceratinae Spath, 1925
  - Genus Hecticoceras Bonarelli, 1893
- Subfamily Mazapilitinae Spath, 1928
- Subfamily Oppeliinae Bonarelli, 1894
  - Genus Cantu-Chapa, 1962
- Subfamily Streblitinae Spath, 1925
  - Genus Böhm & Riedel, 1933
  - Genus Hyatt, 1900
  - Genus Spath, 1925
  - Genus Uhligites Kilian, 1913
- Subfamily incertae sedis
  - Genus McNamara, 1985
Family Strigoceratidae Buckman, 1924
- Genus Oecoptychius
- Genus Hyatt, 1900
- Genus Quenstedt, 1886

References[]

Treatise on Invertebrate Paleontology, Part L Ammonoidea, (L171), Geological Society of America and University of Kansas press, 1964.

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