simultaneous with simultaneous with in taxon amphibian larval development Amphibia Xenopus laevis larval stage amphibian larval stage https://github.com/obophenotype/uberon/issues/534 UBERON:0004728 XtroDO:0000056 Amphibian larvae, sometimes called pollywogs or tadpoles, hatch from eggs and begin to grow limbs and other adult physical features at various times, depending on the species, before they metamorphose into the adult form. polliwog stage larva tadpole larva stage the XAO class denotes a stage tadpole stage polliwog