In biology, a nymph is the immature form of some invertebrates, particularly insects, which undergoes gradual metamorphosis (hemimetabolism) before reaching its adult stage. Unlike a typical larva, a nymph's overall form already resembles that of the adult, except for a lack.
Nymph, in entomology, sexually immature form usually similar to the adult and found in such insects as grasshoppers and cockroaches, which have incomplete, or hemimetabolic, metamorphosis (see metamorphosis). During each successive growing stage (instar) the nymph begins to.
Nymph and Adult Performance of the Small Green Stink Bug, Piezodorus guildinii (Westwood) on Lanceleaf Crotalaria and Soybean. Antônio Ricardo Panizzi.
http://dx.doi.org/10.1590/S1519-566X2008000400001. ECOLOGY, BEHAVIOR AND BIONOMICS. Nymph and adult biology of Dichelops melacanthus (Dallas).
After it reaches the adult stage, it does not molt or grow any more. Nymphs resemble the adult except that their body parts are out of proportion with each other.