Abstract
The three bones studied here have various patterns in the different primitive fossil actinopterygian groups: theyare either separate; or fused in many ways; lastly postrostral and premaxillary disappear in some lineages. Fusion and disparition probably occurred many times. The disappearance of the premaxillary leads either to the lenghtening of the maxillary which contacts that of the other side anteriorly; or to an anterior median notch of the dermal snout. Taxa lacking premaxillaries cannot be related to neopterygians.
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