Prioniodontida

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.^[2] It includes many of the more famous conodonts, such as the giant ordovician Promissum (Prioniodinina) from the Soom Shale^[3] and the Carboniferous specimens from the Granton Shrimp bed (Ozarkodinina).^[4] 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^{[citation needed]}.

Phylogeny

This is a recent cladogram of the Prioniodontida, simplified from Donoghue et al., (2008).^[2]

Prioniodontida

	Paracordylodus

	Polygnathidae

	Idiognathodontidae

Bactrognathidae^{[Note 1]}

Notes

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

References

^ Remarks on the evolution of Ordovician conodonts. J Dzik, Acta Palaeontologica Polonica, 1976, volume 21, no 4 (pdf, retrieved 30 April 2016)
^ ^a ^b 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.
^ 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.
^ 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.

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

[1] Remarks on the evolution of Ordovician conodonts. J Dzik, Acta Palaeontologica Polonica, 1976, volume 21, no 4 (pdf, retrieved 30 April 2016)

[dono2008-2] 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.

[gabbott-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.

[briggs-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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[Note 1]