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Thyestiida is an order of bony-armored jawless fish in the 
Thyestiida
at fossilworks.org (retrieved 21 April 2016) Osteostraci Prehistoric jawless fish orders {{Paleo-jawless-fish-stub
extinct
Extinction is the termination of a kind of organism or of a group of kinds (taxon), usually a species. The moment of extinction is generally considered to be the death of the last individual of the species, although the capacity to breed and ...
vertebrate
Vertebrates () comprise all animal taxa within the subphylum Vertebrata () ( chordates with backbones), including all mammals, birds, reptiles, amphibians, and fish. Vertebrates represent the overwhelming majority of the phylum Chordata, ...
class Osteostraci
The class Osteostraci (meaning "bony shells") is an extinct taxon of bony-armored jawless fish, termed "ostracoderms", that lived in what is now North America, Europe and Russia from the Middle Silurian to Late Devonian.
Anatomically speaking, ...
.The origin and early evolution of the Osteostraci (Vertebrata): A phylogeny for the Thyestiida. Robert S. Sansom, Journal of Systematic Palaeontology, Volume 6, Issue 3, 2008, pages 317-332,
References
External links
Thyestiida
at fossilworks.org (retrieved 21 April 2016) Osteostraci Prehistoric jawless fish orders {{Paleo-jawless-fish-stub