palatalized) [ʂ] voiceless retroflex sibilant (apical or sub-apical) [ʐ] voiced retroflex sibilant (apical or sub-apical) All sibilants are coronal , but may be dental , alveolar , postalveolar , or palatal ( retroflex ) within that range. However, at the postalveolar place of articulation the tongue may take several shapes: domed,