Gill arch supports in Ozarcus are similar to bony fish (right) and not the condrichythyans (left). Pradel A., Maisey J.G., Tafforeau P., Mapes R.H. and Mallatt J. (2014)
A Palaeozoic shark with osteichthyan-like branchial arches.
Nature DOI: 10.1038/nature13195