Thyestiida

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

[3] Illemoraspis[5] Procephalaspis Auchenaspis[2] Thyestes Witaaspis Saaremaspis Tyriaspis Aestiaspis[6] Dartmuthia Timanaspis Oeselaspis Tremataspis Dobraspis[1] Sclerodus Tannuaspis Didymaspis Kiaeraspis Norselaspis Nectaspis Axinaspis Acrotomaspis Gustavaspis

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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 ]