Polymelia in the tadpoles of Bufo melanostictus (Anura : Bufonidae)

In this communication we report vitamin A-induced multiplication of forelim bs and hind limbs in the tadpoles of Bufo melanostictus (Anura: Bufonidae). Different types of limb multiplication, based on the skeletal elements hav e also been investigated. Hind limb bud-stage tadpoles were exposed to vita min A (Palmitate, 10 IU/ml) solution for 24 (set I), 48 (set II) and 72 h ( set III), respectively. Vitamin A caused an exposure-dependent toxic effect on survival of the tadpoles because 10, 30 and 60% tadpoles died prior to the emergence of forelimbs from sets I, II and III, respectively. Metamorph osis was delayed in the experimental tadpoles.