Hecticoceratinae

Hecticoceratinae
Temporal range: Bathonain - Oxfordian
Scientific classification
Class: Cephalopoda
Subclass: Ammonoidea
Order: Ammonitida
Superfamily: Haplocerataceae
Family: Oppeliidae
Subfamily: Hecticoceratinae
Spath 1925
Genera

See text

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.[1]

The Hecticocerainae, which has its origin in the Oppeliinae, give rise to the Distichoceratinae near the beginning of the Middle Jurassic Callovian, and to the Glochiceratinae early in the Upper Jurassic Oxfordian.[2] Neither apparently gave rise to any subsequent groups.

Genera

Hecticoceras, Brightia, Eochetoceras, Hecticoceratoides, Lunuloceras, Kheraites, Proheticoceras, Pseudobrightia, and Pseudobrightia, listed as separate genera in the Treatise[1] are regarded as subgenera of Hecticoceras

References

  1. 1 2 Treatise on Invertebrate Paleontology Part L, L276 (Ammonoidea)
  2. ↑ Classification of Jurassic Ammonitina, D.T. Donovan, et al., Systematics Assoc., 1981
This article is issued from Wikipedia - version of the 11/15/2015. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.