Английская Википедия:Eriptychiida

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Шаблон:Short description Шаблон:Automatic Taxobox

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.

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

In study at 2023, Eriptychius is placed just under Vertebrata, not considering class or order.[4]

See also

References

Шаблон:Reflist

External links

Шаблон:Taxonbar


Шаблон:Pteraspidomorphi-stub Шаблон:Ordovician-animal-stub

de:Pteraspidomorphi#Eriptychiida