Hybodus_fraasi_(fossil)588 Published December 18, 2020 at 588 × 236 in Prohalecites: the new tiny ancestor of all bony ray fin fish Figure 2. Hybodus fraasi fossil in situ is 50x larger than an adult Prohalecites, the basalmost bony fish. Figure 2. Hybodus fraasi fossil in situ is 50x larger than an adult Prohalecites, the basalmost bony fish.