It is generally believed that jaws evolved from a gill arch, but this is unsupported by palaeontological or developmental data. Gillis et al. study three gnathostome taxa and identify a conserved molecular mechanism that delineates the dorsal and ventral skeletal segments of the jaw, hyoid and gill arches.
- J. Andrew Gillis
- Melinda S. Modrell
- Clare V. H. Baker
