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Prioniodontida ("Complex conodonts") Temporal range: PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	†Conodonta
Clade:	†Euconodonta
Clade:	†Prioniodontida Dzik, 1976
Orders
See text

Prioniodontida, also known as the "complex conodonts", is a large clade of conodonts that includes two major evolutionary grades; the Prioniodinina and the Ozarkodinina. It includes many of the more famous conodonts, such as the giant ordovician Promissum (Prioniodinina) from the Soom Shale and the Carboniferous specimens from the Granton Shrimp bed (Ozarkodinina). They are euconodonts, in that their elements are composed of two layers; the crown and the basal body, and are assumed to be a clade.

Phylogeny

This is a recent cladogram of the Prioniodontida, simplified from Donoghue et al., (2008).

Notes

1. Bactrognathidae is actually only one of two families (the other unnamed) belonging to a superfamily that is as yet unnamed.

References

1. Remarks on the evolution of Ordovician conodonts. J Dzik, Acta Palaeontologica Polonica, 1976, volume 21, no 4 (pdf, retrieved 30 April 2016)
2. ^ Donoghue, P.C.J.; Purnell, M.A.; Aldridge, R.J.; Zhang, S. (2008). "The interrelationships of 'complex' conodonts (Vertebrata)". Journal of Systematic Palaeontology. 6 (2): 119–153. doi:10.1017/s1477201907002234. S2CID 8005990.
3. Gabbott, S.E.; Aldridge, R.J.; Theron, J.N. (1995). "A giant conodont with preserved muscle tissue from the Upper Ordovician of South Africa". Nature. 374 (6525): 800. Bibcode:1995Natur.374..800G. doi:10.1038/374800a0. S2CID 4342260.
4. Briggs, D.E.G; Clarkson, E.N.K.; Aldridge, R.J. (1983). "The conodont animal". Lethaia. 16 (1): 1–14. doi:10.1111/j.1502-3931.1983.tb01993.x.

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Forerunners	Basal member †Pikaia Cephalochordate †Cathaymyrus Lancelet Olfactores †Haikouella Tunicate †Myllokunmingiidae? (†Haikouichthys, †Myllokunmingia) †Zhongxiniscus?
Jawless fish	Cyclostomata Hagfish Hyperoartia Lamprey †Conodonts †Protoconodonta? †Paraconodontida †Conodonta †Ostracoderms †Pteraspidomorphi †Thelodonti †Anaspida †Cephalaspidomorphi †Galeaspida †Pituriaspida †Osteostraci
Jawed fish	†Placoderms †Antiarchi †Arthrodira †Brindabellaspida †Petalichthyida †Phyllolepida †Ptyctodontida †Rhenanida †Acanthothoraci †Pseudopetalichthyida? †Stensioellida? †Acanthodii †Acanthodiformes †"Climatiiformes" †Diplacanthiformes †Ischnacanthiformes Cartilaginous Elasmobranchii †Ctenacanthiformes †Hybodontiformes †Phoebodontiformes †Xenacanthida Ray Shark Holocephali †Eugeneodontida †Iniopterygiformes †Petalodontiformes †Symmoriiformes Chimaera Bony Lobe-finned †Onychodontiformes Coelacanth Rhipidistia †Porolepiformes Lungfish Tetrapodomorpha Ray-finned †"Palaeonisciformes" Cladistia Polypteriformes Chondrostei Acipenseriformes Neopterygii †Pycnodontiformes Halecomorphi Ginglymodi Teleost
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Related	Prehistoric life Transitional fossils Vertebrate paleontology
† extinct

• Prioniodontida
• Vertebrate unranked clades