Abstract
The palatoquadrate in Eusthenopteron displays certain variation concerning the extent of its commissural lamina, and the presence of imprints of vessels and nerves on the outer surface of this middle part of the element. Comparison with some contemporary fishes revealed that branches of the arteria ophthalmica magna or of the ramus palatinus posterior VII could have produced these imprints. The grooves are connected with canals piercing the bone along its pars pterygoquadrata. Possible explanation is that the autopalatine and pterygoquadrate portions of the palatoquadrate were free in early developmental stages and later become interconnected by cartilage and bone. The dual nature of the palatoquadrate is shown to occur not only in the development of some Recent fishes, but in extinct groups (e. g., placoderms) as well.
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