Thyestiida

Thyestiida is an order of bony-armored jawless fish in the extinct vertebrate class Osteostraci.[2]

The osteostracans reconstructed here belong to the major clade Cornuata, whose generalised morphology is exemplified by the zenaspidid Zenaspis (bottom left). Some highly derived head-shield morphologies are exemplified by the benneviaspidids Hoelaspis (top right) and Tauraspis (top left), or the thyestiid Tremataspis (bottom right). The latter, of the family Tremataspididae, has lost the paired fins, possibly as a consequence of an adaptation to burrowing habits.[3]
Thyestiida
Thyestiida
 

Illemoraspis[4]

 
 
 

Procephalaspis

 
 
 

Auchenaspis[5]

 
 
 

Thyestes

 
 
 

Witaaspis

 
 
Tremataspidoidea
 

Saaremaspis

 
 

Tyriaspis

 
 
 

Aestiaspis[6]

 
 

Dartmuthia

 
 
 

Timanaspis

 
 
 
 

Oeselaspis

 
 

Tremataspis

 
 
 
 

Dobraspis[1]

 
 
 

Sclerodus

 
 

Tannuaspis

 
 
 
 
 
 
 
Kiaeraspidoidea
 

Didymaspis

 
 
 

Kiaeraspis

 
 

Norselaspis

 
 
 

Nectaspis

 
 
 

Axinaspis

 
 
 

Acrotomaspis

 
 

Gustavaspis

 
 
 
 
 
 
 
 
 
 
 
 
Cladogram, according to Sansom, 2009[7]

Thyestiida
Thyestes verrucosus, natural size. The Origin of Vertebrates by Walter Holbrook Gaskell 1908, Fig. 13, from Woodward)
Scientific classification
Kingdom:
Animalia
Phylum:
Chordata
Class:
†Osteostraci
Order:
†Thyestiida

Janvier 1996
Families
  • †Tannuaspididae[1]
  • †Thyestiidae
  • †Tremataspididae

References
  1. A new tremataspidid (Vertebrata, Osteostraci, Thyestiida) from the Devonian of northern Urals, with remarks on tannuaspidids. Elga Mark-Kurik and Philippe Janvier, Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen 01/1997; 206(3), pages 405-421
  2. 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, doi:10.1017/S1477201907002386
  3. Janvier, Philippe (1997) Osteostraci The Tree of Life Web Project.
  4. The anatomy, affinity and phylogenetic significance of Ilemoraspis kirkinskayae (Osteostraci) from the Devonian of Siberia. Robert S. Sansom, Sergei A. Rodygin and Philip C. J. Donoghue, Journal of Vertebrate Paleontology, Volume 28, Issue 3, 2008, pages 613-625, doi:10.1671/0272-4634(2008)28[613:TAAAPS]2.0.CO;2
  5. A review of the problematic Osteostracan genus Auchenaspis and its role in Thyestidian evolution. Robert Sansom, Palaeontology, Volume 50, Issue 4, pages 1001–1011, July 2007, doi:10.1111/j.1475-4983.2007.00686.x
  6. New data on the exoskeleton of the osteostracan genus Aestiaspis (Agnatha) from the Silurian of Saaremaa Island (Estonia) and the Severnaya Zemlya Archipelago (Russia). O. B. Afanassieva and T. Märss, Paleontological Journal February 2014, Volume 48, Issue 1, pages 74-78, doi:10.1134/S003103011401002X
  7. Sansom, R. S. (2009). "Phylogeny, classification and character polarity of the Osteostraci (Vertebrata)". Journal of Systematic Palaeontology. 7: 95–115. doi:10.1017/S1477201908002551.


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