Editing Metamorphosis (section)

=== Development and terminology ===
[[File:Holometabolous vs. Hemimetabolous.svg|thumb|Two types of metamorphosis are shown. In a complete (holometabolous) metamorphosis the insect passes through four distinct phases, which produce an adult that does not resemble the larva. In an incomplete (hemimetabolous) metamorphosis an insect does not go through a full transformation, but instead transitions from a nymph to an adult by molting its exoskeleton as it grows.]]
In [[Hemimetabolism|hemimetabolous]] [[insects]], immature stages are called [[Nymph (biology)|nymphs]].  Development proceeds in repeated stages of growth and [[ecdysis]] (moulting); these stages are called [[instar]]s. The juvenile forms closely resemble adults, but are smaller and lack adult features such as wings and genitalia. The size and morphological differences between nymphs in different instars are small, often just differences in body proportions and the number of segments; in later instars, external wing buds form. The period from one molt to the next is called a stadium.<ref>{{cite journal |last1=Schaefer |first1=C.W. |title=Instar, Stadium, and Stage: A New Look at Old Questions |journal=Bulletin of the Entomological Society of America |date=March 1971 |volume=17 |issue=1 |page=17 |doi=10.1093/besa/17.1.17c }}</ref>

In [[holometabolous]] insects, immature stages are called [[larva]]e and differ markedly from  adults. Insects which undergo holometabolism pass through a larval stage, then enter an inactive state called [[pupa]] (called a [[pupa#Chrysalis|"chrysalis]]" in butterfly species), and finally emerge as adults.<ref name="Lowe">{{cite journal |first1=Tristan |last1=Lowe |first2=Russell P. |last2=Garwood |first3=Thomas |last3=Simonsen |first4=Robert S. |last4=Bradley |first5=Philip J. |last5=Withers |date=July 6, 2013 |volume=10 |issue=84 |at=20130304 |doi=10.1098/rsif.2013.0304|pmid=23676900 |pmc=3673169 |title=Metamorphosis revealed: Time-lapse three-dimensional imaging inside a living chrysalis |journal=Journal of the Royal Society Interface }}</ref>