Autostylic jaw suspension is divided into 3 subtypes a)HOLOSTYLIC In this upper jaw is firmly fused with skull and lower jaw suspended from it.hyoid arch is complete ,independent and not attached to skull; Eg:chimaeras b)MONIMOSTYLIC In many tetrapods , hyomandibular forms columella and articular articulates with quadrate. However ,the quadrate remains immovably attached with skull. c)STREPTOSTYLIC Quadrate is loosely attached and is movable at both ends a condition known as streptostylic.Eg:reptiles (lizzard,snakes)and birds