Guildayichthys carnegiei

Guildayichthys carnegiei is more plesiomorphous than its sister taxon, Discoserra pectinodon, in a number of ways. The body is a bit less rounded, the mid-dorsal scales overlap backward rather than being forward-pointed hooks, and the scales seem less tall.  The gape of the mouth is a bit longer, the teeth shorter, and the snout less pointed. The bones of the skull, however, show the same peculiar mixture of what appear to be very primitive and highly derived actinopterygian characters.
The scale is in mm.

Reference:

• Lund, R. 2000. "The new actinopterygian order Guildayichthyiformes from the Lower Carboniferous of Montana (USA)". Geodiversitas (MNHN, Paris) 22 (2): 171-206.

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