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Thyestiida

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Thyestiida
The Origin of Vertebrates 1908 Fig. 13.— Auchenaspis (Thyestes) verrucosus, natural size. (From Woodward.)
Scientific classification
Kingdom:
Animalia
Phylum:
Chordata
Class:
†Osteostraci
Order:
†Thyestiida

Janvier 1996
Families

Thyestiida was an order of bony-armored jawless fish in the class Osteostraci.

Thyestiida
Thyestiida
Cladogram
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 has lost the paired fins, possibly as a consequence of an adaptation to burrowing habits.[1]

References

  1. ^ Janvier, Philippe (1997) Osteostraci The Tree of Life Web Project.
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