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

摘要

In this communication we report vitamin A-induced multiplication of forelimbs and hind limbs in the tadpoles of Bufo melanostictus (Anura: Bufonidae). Different types of limb multiplication, based on the skeletal elements have also been investigated. Hind limb bud-stage tadpoles were exposed to vitamin 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. Metamorphosis was delayed in the experimental tadpoles. [References: 21]