Eriptychiida
| Eriptychiida Temporal range: Late Ordovician,
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Scientific classification 
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| Kingdom: | Animalia |
| Phylum: | Chordata |
| Infraphylum: | Agnatha |
| Class: | †Pteraspidomorphi |
| Subclass: | †Heterostracomorphi |
| Infraclass: | †Eriptychiida Tarlo 1962 |
| Order: | †Eriptychiiformes Ørvig 1958 |
| Families | |
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Eriptychiida is an extinct marine taxon of vertebrate in the group Pteraspidomorphi.
The order contains the genus, , and fossilized specimens from this genus have been found in the Gull River Formation of Ontario, the Harding Formation of Colorado and the Bighorn Dolomite of Wyoming. The group contains two documented species: Eriptychius americanus and Eriptychius orvigi.
Characteristics[]
The structure of the dentine of eriptychiids is in many respects closer to that of heterostracans that to that of astraspids. This is the only argument to place them as the closest relatives to heterostracans, among the Ordovician vertebrates. However, eriptychiids differ from all other pteraspidomorphs in having a massively calcified endoskeleton, pervaded by canals for blood vessels.
Taxonomy[]
- Order † Ørvig 1958[1][2][3]
- Genus ?† Sansom & Smith 2005
- Family † Tarlo 1962
- Genus † Walcott 1892
- Family † Märss & Karatajūtė-Talimaa 2009
- Genus † Lankester 1870
- Genus † Pander 1856 non Groß 1961 [Strosipherus Pander 1856]}
See also[]
References[]
- ^ Haaramo, Mikko (2003). "Pteraspidomorphi". in Mikko's Phylogeny Archive. After Carroll, 1988, and Janvier, 1997. Retrieved 26 October 2013.
- ^ Nelson, Joseph S.; Grande, Terry C.; Wilson, Mark V. H. (2016). Fishes of the World (5th ed.). John Wiley & Sons. ISBN 9781118342336.
- ^ van der Laan, Richard (2018). "Family-group names of fossil fishes" (PDF). European Journal of Taxonomy (466): 1–167. doi:10.5852/ejt.2018.466.
External links[]
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- Pteraspidomorphi
- Prehistoric jawless fish orders
- Ordovician jawless fish
- Late Ordovician animals
- Ordovician fish of North America
- Late Ordovician first appearances
- Late Ordovician taxonomic orders
- Late Ordovician extinctions
- Pteraspidomorphi stubs
- Ordovician animal stubs