Вилични ’рбетници: Разлика помеѓу преработките

{{Taxobox

| color = lightblue

 

Се верува дека вилиците еволуирале од предните потпорни [[Жабри|жабрени]] лакови, кои преземале нова улога.

 

It is believed that the jaws evolved from anterior [[gill]] support arches that had acquired a new role, being modified to pump water over the gills by opening and closing the mouth more effectively — the [[buccal pump]] mechanism. The mouth could then grow bigger and wider, making it possible to capture larger prey. This close and open mechanism would with time become stronger and tougher, being transformed into real jaws.