Antiarchi

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Antiarchi

[‚an·tē′är‚kī]
(paleontology)
A division of highly specialized placoderms restricted to fresh-water sediments of the Middle and Upper Devonian.
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The MNI of Phyllolepis tolli and Devononchus tenuispinus (see Tables 2, 3) is only slightly smaller than that of the antiarch placoderms (Bothriolepis), whereas other taxa, constituted by Dunkleosteus, Chelyophorus and sarcopterygians, are represented by minor MNI, but the actual number of remains varies greatly from only one specimen of Dunkleosteus sp.
2011) and the antiarch placoderm Asterolepis ornata, demonstrating head shields with plates tightly connected long after disintegration of the trunk shield (Upeniece 1999).
Comparison of representation of the skeletal elements of the two antiarch placoderm fishes shows that the same number of individuals of B.
The most probable large predator of that times capable of making such damage to the armour of the antiarch placoderms could be the giant euarthrodire placoderm Dunkleosteus or large sarcopterygian Holoptychius.
These are represented by species of arthrodires Coccosteus, Watsonosteus and Plourdosteus and antiarchs Asterolepis and Bothriolepis.