Oppeliinae is a subfamily within the
Oppeliidae
Oppeliidae are compressed to oxyconic, sculptured Haploceratoidea, either unkeeled, unicarinate, bicarinate, or tricarinate; with sutures in great variety, but ribbing usually more or less falcoid or falcate. The Oppeliidae is the principal famil ...
, a family of Jurassic ammonites characterized by forms that are mainly oxyconic, compressed with sharp venters, in the adult and with keeled inner whorls. Sutures are complex, consisting of a long series of evenly graded lobes and saddles with finely frilled endings.
[Treatise on Invertebrate Paleontology Part L ''L274'',(Ammonoidea)]
The Oppeliinae gave rise to the
Hecticoceratinae
Hecticoceratinae is a subfamily of oppeliids from the Middle and Upper Jurassic typically with strong falcoid or falcate ribbing that covers whorl sides completely. Venters are usually keeled and may be tricarinate.Treatise on Invertebrate Paleo ...
in the early Bathonian stage, near the middle of their range and to the
Taramelliceratinae, in the late Callovian, near the end of their tange, which in turn gave rise to the
Streblitinae in the early Kimmeridgian and to the
Haploceratidae
The Haploceratidae is the type family of the Haploceratoidea, a superfamily in the ammonitina; which according to Donovan ''et al.'' (1981) can be derived from the Taramelliceratinae, a subfamily of the Oppeliidae.
Haploceratids, (Haploceratidae ...
in the late Kimmeridgian.
[Classification of Jurassic Ammonitina, D.T. Donovan, ''et al.'' Systematics Assoc no 18]
Distribution is worldwide, from the Middle Jurassic, except for Boreal regions.
List of genera
The Oppeliinae includes the following genera,
[ listed in order of appearance.
:'' Bradfordia''
:'']Oppelia
''Oppelia'' is a haploceratoid ammonite and type genus for the Oppeliidae that lived during the Middle Jurassic
The Middle Jurassic is the second epoch of the Jurassic Period. It lasted from about 174.1 to 163.5 million years ago. Fossils of ...
''
:''Oxycerites
''Oxycerites'' is an extinct ammonoid cephalopod belonging to the haploceratoid family, Oppeliidae
Oppeliidae are compressed to oxyconic, sculptured Haploceratoidea, either unkeeled, unicarinate, bicarinate, or tricarinate; with sutures in ...
''
:'' Paralcidia''
:'' Strugia''
:'' Trimargina''
:'' Magharina''
:'' Oecostraustes''
:'' Stregoxites''
References
Oppeliidae
Jurassic ammonites
Bathonian first appearances
Middle Jurassic extinctions
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