dengan Alizarin Red The Ossification Study and Tadpoles Morphokinetic of Rana catesbeiana Shaw . with Alizarin

Tadpole is a phase of frog metamorphosis. The frog tadpoles live in water, before the anterior extremities and posterior extremities are formed. Posterior limb growth is accompanied by calcifications and the anterior extremity followed by shortening of the tadpole tail. The aim research was to determine the ossification and morphokinetics of tadpoles in the posterior extremities, anterior limbs and tadpole tail shrinkage. The frog tadpoles do not have legs and move using tails. The research method uses descriptive quantitative techniques. The tadpoles were used a 4-month-old metamorphosis result. The bones have happened ossification that are marked by a change in the color of the bone to purplish red. The frog tadpoles develop in two phases, including the embryonic phase and the larval phase. The formation of hind limbs occurs in stages of 26-30, followed by toe development in stages of 31-37. The anterior extremities are corroded: the humerus os, the radio –ulna os, the os metacarpal and the falangs os, the posterior limb: the femoral os, the tibio-fibular os, the tarsal os and the metatarsal os.