| Eriptychiida Temporal range: Late Ordovician,
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| Specimen of Eriptychius americanus | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Infraphylum: | Agnatha |
| Class: | †Pteraspidomorphi |
| Subclass: | †Heterostracomorphi |
| Infraclass: | †Eriptychiida Tarlo 1962 |
| Order: | †Eriptychiiformes Ørvig 1958[1] |
| Families | |
Eriptychiida is an extinct marine taxon of vertebrate in the group Pteraspidomorphi.
The order contains the genus, Eriptychius, 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.
- ^ Ørvig, T. 1958. Pycnaspis splendens, new genus, new species, a new ostracoderm from the Upper Ordovician of North America. Proceedings of the United States National Museum 108(3391): 1-23. DOI: 10.5479/si.00963801.108-3391.1