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Cladus: Eukaryota
Supergroup: Opisthokonta
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Cladus: Protostomia
Cladus: Spiralia
Cladus: Lophotrochozoa
Phylum: Mollusca
Classis: Cephalopoda
Subclassis: †Ammonoidea
Ordo: Ammonitida
Subordo: Ammonitina
Superfamilia: Haplocerataceae
Familiae: Haploceratidae - Oppeliidae


Haplocerataceae Zittel, 1884


* The Paleobiology Database Accessed on 12/14/08

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

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


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


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

Superfamily Haplocerataceae Zittel, 1884

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


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

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Source: Wikipedia, Wikispecies: All text is available under the terms of the GNU Free Documentation License