Onychodontiformes

Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Superphylum: Deuterostomia
Phylum: Chordata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Megaclassis: Osteichthyes
Cladus: Sarcopterygii
Ordo: †Onychodontiformes

Familia: †Onychodontidae
Name

†Onychodontiformes Andrews, 1973
Synonyms

†Onychodontida Andrews, 1973

References

Andrews, S.M. 1973. Interrelationships of crossopterygians. Pp. 137-177 in Greenwood, P.H., Miles, R.S. & Patterson, C. (eds.): Interrelationships of Fishes. Academic Press, London. Reference page.
Schultze, H.P. 1973. Crossopterygier mit heterozerker Schwanzflosse aus dem Oberdevon Kanadas, nebst einer Beschreibung von Onychodontida-Resten aus dem Mittledevon Spaniens und aus dem Karbon der USA. Palaeontographica Abt. A. 143: 188-208. Reference page.

Onychodontiformes (also known as Onychodontida and Struniiformes) is an order of prehistoric sarcopterygian fish that lived during the Devonian period. The onychodontiforms are generally regarded as early-diverging members of the coelacanth lineage.[2][1]
Phylogeny

The following cladogram is adapted from Mondéjar-Fernández (2020). The study recovered Onychodontiformes as a paraphyletic group, which is shown in green:[1]
Crown-Sarcopterygii

References

Mondéjar-Fernández, J. (2020). "A new onychodont (Osteichthyes; Sarcopterygii) from the Middle Devonian of Morocco and its bearing on early osteichthyan evolution". Journal of Systematic Palaeontology. 18 (7): 573–606. doi:10.1080/14772019.2019.1655495. S2CID 208586697.
Lu, J.; Zhu, M.; Ahlberg, P. E.; Qiao, T.; Zhu, Y.; Zhao, W.; Jia, L. (2016). "A Devonian predatory fish provides insights into the early evolution of modern sarcopterygians". Science Advances. 2 (6): e1600154. Bibcode:2016SciA....2E0154L. doi:10.1126/sciadv.1600154. PMC 4928971. PMID 27386576.