Short one today,
as I continue to wrestle with ray-fin fish. It’s coming together, but slowly. Lots of corrections have been made over the last several weeks.
Trying to figure out the cranial roof in ray fin fish
can be simple in one taxon, vexing in another. Here (Fig. 1) are a few taxa to illustrate what happens to the parietal in a phylogenetic series.
On the other hand, taking a more conservative route,
the lobefin fish, Eusthenoopteron (Fig. 1), retains the primitive skull roof pattern seen in Prohalecites, a basal bony fish, close to Hybodus and other sharks.
Thank you for your patience.