part of overlaps develops from start stage end stage quadrate TAO:0000621 zebrafish_anatomy quadrates The quadrate is the dorsal bone in the jaw joint with the anguloarticular of the lower jaw. Ossification of the quadrate, a cartilage bone, begins as a posteriorly projecting membranous spine between the symplectic cartilage and the preopercle (5.1 mm NL). The body of the quadrate ossifies first at the ball-and-socket articulation with the anguloarticular (6.5 mm). The adult quadrate is shaped roughly like an inverted triangle with a long, posteriorly projecting spine off its posteroventral edge. The presence of a posteroventral or posterior process of the quadrate is a synapomorphy of Teleostei. ZFA:0000621 palatoquadrate arch palatoquadrate cartilage endochondral bone quadrate-metapterygoid joint quadrate-entopterygoid joint larval:days 7-13 adult