| Hexanchiformes Temporal range:
Possible Permian record
| |
|---|---|
| |
| Broadnose sevengill shark (Notorynchus cepedianus) | |
| |
| Frilled shark (Chlamydoselachus anguineus) | |
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Chondrichthyes |
| Subclass: | Elasmobranchii |
| Clade: | Neoselachii |
| Subdivision: | Selachimorpha |
| Superorder: | Squalomorphii |
| Order: | Hexanchiformes F. de Buen, 1926 |
| Families | |
|
†Paraorthacodontidae? Suborder Hexanchoidei | |
The Hexanchiformes /hɛkˈsæŋkɪfɔːrmiːz/ are a primitive order of sharks,[a] numbering just seven extant species in two families. Fossil sharks that were apparently very similar to modern sevengill species are known from Jurassic specimens.[2]
- ^ Froese, Rainer; Pauly, Daniel (eds.). "Order Hexanchiformes". FishBase. January 2009 version.
- ^ Allen, Thomas B. (1999). The Shark Almanac. New York: The Lyons Press. p. 45. ISBN 1-55821-582-4.
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