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Thyestiida

Order of jawless fishes From Wikipedia, the free encyclopedia

Thyestiida

Thyestiida is an order of bony-armored jawless fish in the extinct vertebrate class Osteostraci.[3]

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.[4]
Thyestiida
Thyestiida

Illemoraspis[5]

Procephalaspis

Auchenaspis[1]

Thyestes

Witaaspis

Tremataspidoidea

Saaremaspis

Tyriaspis

Aestiaspis[6]

Dartmuthia

Timanaspis

Oeselaspis

Tremataspis

Dobraspis[2]

Sclerodus

Tannuaspis

Kiaeraspidoidea

Didymaspis

Kiaeraspis

Norselaspis

Nectaspis

Axinaspis

Acrotomaspis

Gustavaspis

Cladogram, according to Sansom, 2009[7]

Quick Facts Scientific classification, Families ...
Thyestiida
Auchenaspis sp.[1] from The Origin of Vertebrates by Walter Holbrook Gaskell 1908, Fig. 13, from Woodward)
Scientific classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Infraphylum: Agnatha
Superclass: †Cephalaspidomorphi
Class: †Osteostraci
Order: †Thyestiida
Janvier 1996
Families
  • †Tannuaspididae[2]
  • †Thyestiidae
  • †Tremataspididae
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References

External links

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