An instar (/ˈɪnstɑːr/ⓘ, from the Latin īnstar 'form, likeness') is a developmental stage of
arthropods, such as
insects, which occurs between each
moult (ecdysis) until
sexual maturity is reached.[1] Arthropods must shed the
exoskeleton in order to grow or assume a new form. Differences between instars can often be seen in altered body proportions, colors, patterns, changes in the number of body segments or head width. After shedding their exoskeleton (moulting), the juvenile arthropods continue in their life cycle until they either pupate or moult again. The instar period of growth is fixed; however, in some insects, like the
salvinia stem-borer moth, the number of instars depends on early larval nutrition.[2] Some arthropods can continue to moult after sexual maturity, but the stages between these subsequent moults are generally not called instars.
For most insect species, an instar is the developmental stage of the
larval forms of
holometabolous (complete metamorphism) or
nymphal forms of
hemimetabolous (incomplete metamorphism) insects, but an instar can be any developmental stage including
pupa or
imago (the adult, which does not moult in insects).
The number of instars an insect undergoes often depends on the species and the environmental conditions, as described for a number of species of Lepidoptera. However, it is believed [by whom?] that the number of instars can be physiologically constant per species in some insect orders, as for example
Diptera and
Hymenoptera. The number of larval instars is not directly related to speed of development. For instance, environmental conditions may dramatically affect the developmental rates of species and still have no impact on the number of larval instars. As examples, lower temperatures and lower humidity often slow the rate of development and that may have an effect on how many molts an insect will undergo – an example of this is seen in the lepidopteran
tobacco budworm.[3] On the other hand, temperature affects the development rates of a number of hymenopterans without affecting numbers of instars or larval morphology, as observed in the
ensign wasp[4][5] and in the red imported fire ant.[6][7] The number of larval instars in ants has been the subject of a number of recent investigations,[8] and no instance of temperature-related variation in numbers of instars has yet been recorded.[9]
^Allaby, Michael: A Dictionary of Ecology, page 234. Oxford University Press, US, 2006.
^Knopf, K. W.; Habeck, D. H. (1 June 1976). "Life History and Biology of Samea multiplicalis". Environmental Entomology. 5 (3): 539–542.
doi:
10.1093/ee/5.3.539.
^Bressan-Nascimento, S.; Fox, E.G.P.; Pilizi, L.G.T. (February 2010). "Effects of different temperatures on the life history of Evania appendigaster L. (Hymenoptera: Evaniidae), a solitary oothecal parasitoid of Periplaneta americana L. (Dictyoptera: Blattidae)". Biological Control. 52 (2): 104–109.
doi:
10.1016/j.biocontrol.2009.10.005.
^Porter, Sanford D. (1988). "Impact of temperature on colony growth and developmental rates of the ant, Solenopsis invicta". Journal of Insect Physiology. 34 (12): 1127–1133.
doi:
10.1016/0022-1910(88)90215-6.