Onychodontiformes (also known as Onychodontida and Struniiformes) is an order of prehistoric

sarcopterygian Sarcopterygii (; ) — sometimes considered synonymous with Crossopterygii () — is a taxon (traditionally a class or subclass) of the bony fishes known as the lobe-finned fishes. The group Tetrapoda, a mostly terrestrial superclass includi ...

fish that lived during the

Devonian The Devonian ( ) is a geologic period and system of the Paleozoic era, spanning 60.3 million years from the end of the Silurian, million years ago (Mya), to the beginning of the Carboniferous, Mya. It is named after Devon, England, whe ...

period. The onychodontiforms are generally regarded as early-diverging members of the

coelacanth The coelacanths ( ) are fish belonging to the order Actinistia that includes two extant species in the genus ''Latimeria'': the West Indian Ocean coelacanth (''Latimeria chalumnae''), primarily found near the Comoro Islands off the east coast ...

lineage.

Phylogeny

The following cladogram is adapted from Mondéjar-Fernández (2020). The study recovered Onychodontiformes as a

paraphyletic In taxonomy (general), taxonomy, a group is paraphyletic if it consists of the group's most recent common ancestor, last common ancestor and most of its descendants, excluding a few Monophyly, monophyletic subgroups. The group is said to be pa ...

group, which is shown in green:

References

External links

Onychodontiformes at Palaeos

Prehistoric lobe-finned fish Prehistoric fish orders Devonian bony fish Early Devonian first appearances Famennian extinctions Paraphyletic groups {{paleo-lobefinned-fish-stub