FIGURE 6.

Morphological variation of the palatal shelves in chameleon embryos. Variability of the palatal region in embryonic chameleons within 15th week of the pre-hatching development (A–D). Embryonic heads are aligned from the smallest (A) to the largest (D). Head lengths were measured from the tip of the rostrum to the most caudal part of the pterygoid bones (distance A); the measurements in panel (E) were used for correlation analyses between individual parameters (F–J). Head width and palatal shelves width are shown in millimeters. 48 embryos were analyzed. Ninety five percent confidence regression bands are shown as dashed curves. ec, ectopterygoid; j, jugal bone; mx, maxillary bone; pl, palatine bone; pt, pterygoid bone. Scale bar (A–D): 2 mm.