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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]

References

The dictionary definition of instar at Wiktionary

^ 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.
^ "tobacco budworm - Heliothis virescens (Fabricius)". entnemdept.ufl.edu. Retrieved 2017-11-09.
^ Fox, Eduardo Gonçalves Paterson; Solis, Daniel Russ; Rossi, Mônica Lanzoni; Eizemberg, Roberto; Taveira, Luiz Pilize; Bressan-Nascimento, Suzete (June 2012). "The preimaginal stages of the ensign wasp Evania appendigaster (Hymenoptera, Evaniidae), a cockroach egg predator". Invertebrate Biology. 131 (2): 133–143. doi:10.1111/j.1744-7410.2012.00261.x.
^ 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. Bibcode:2010BiolC..52..104B. 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. Bibcode:1988JInsP..34.1127P. doi:10.1016/0022-1910(88)90215-6.
^ Fox, Eduardo Gonçalves Paterson; Solis, Daniel Russ; Rossi, Mônica Lanzoni; Delabie, Jacques Hubert Charles; de Souza, Rodrigo Fernando; Bueno, Odair Correa (2012). "Comparative Immature Morphology of Brazilian Fire Ants (Hymenoptera: Formicidae: Solenopsis)". Psyche: A Journal of Entomology. 2012: 1–10. doi:10.1155/2012/183284. hdl:11449/73193.
^ Fox, Eduardo G. P.; Smith, Adrian A.; Gibson, Joshua C.; Solis, Daniel R. [UNESP (1 October 2017). "Larvae of trap jaw ants, Odontomachus LATREILLE, 1804 (Hymenoptera: Formicidae): morphology and biological notes". Myrmecological News: 17–28. hdl:11449/163472.
^ Russ Solis, Daniel; Gonçalves Paterson Fox, Eduardo; Mayumi Kato, Luciane; Massuretti de jesus, Carlos; Teruyoshi Yabuki, Antonio; Eugênia de Carvalho Campos, Ana; Correa Bueno, Odair (March 2010). "Morphological Description of the Immatures of the Ant". Journal of Insect Science. 10 (15): 15. doi:10.1673/031.010.1501. PMC 3388976. PMID 20575746.