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  Encyclopedia of Keywords > Nature > Life > Animals > Arthropods > Instar   Michael Charnine

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  1. An instar is a developmental stage of arthropods, such as insects, between each molt.
  2. An instar is a developmental stage of arthropods, such as insects, between each moult ( ecdysis), until sexual maturity is reached.
  3. InStar is a comprehensive agency management solution that integrates Microsoft Office and various Multiple Rating programs.


  1. In other cases, the new instar is altered in the proportions between body regions or number of segments.
  2. Sphinx instar is a species of moth in the Sphingidae family.
  3. They define an instar group, within which all individuals have had five instars.
  4. They feed in groups during their first instar and then disperse on the wind using silken threads.


  1. In hemimetabolism, the development of larva often proceeds in repeated stages of growth and ecdysis (moulting), these stages are called instar s.
  2. Description and figures of the final instar larva are given.
  3. The first instar larva is markedly different from later instars; in the Strepsiptera it has legs and eyes, which it loses on finding a host and molting.
  4. The development of insect larva (like that of other arthropods) often also proceeds in stages called instar s advanced by ecdysis (moulting).


  1. Incomplete metamorphosis in the grasshopper with different instar nymphs The immature stages of a species that metamorphoses are usually called larvae.
  2. The pupal stage is passed in the soil within the cuticle of the last instar larvae.
  3. Larvae make their way to the soil, leaf trash or to the base of live lettuce leaves to pupate within the cuticle of their last larval instar.

Last Larval

  1. Development of butterfly wing patterns begins by the last larval instar.
  2. In the last larval instar, the critical weight marks the initiation of a dramatic change in physiology.
  3. It has been known for some time that the last larval instar has a distinctive developmental physiology that differs from that of the earlier instars 14.
  4. During the last larval instar there are three physiological decision points (diamonds) that control the timing of the cessation of growth.


  1. Blister-beetle larvae develop by hypermetamorphosis: Each growth stage, or instar, is different in appearance and habits.
  2. At the end of each instar the larva molts the old cuticle, and the new cuticle rapidly hardens and pigments.
  3. As a consequence, the mass of a larva at each larval molt increases exponentially from instar to instar (Figure 4).
  4. Within each instar, growth is also approximately exponential, but it is clear that the exponent declines progressively from instar to instar.


  1. Thus, if Manduca had six or more larval instars, we would expect the fifth instar to molt to the sixth at a mass of about 5.4 g.
  2. Shortly before pupation, the final, fifth instar caterpillar will engage in a "gut dump" where any excess water and fluids are expelled.


  1. The actual final mass of the fifth instar is about 11.5 g, about twice the expected mass.
  2. The initial mass of each larval instar is a constant multiple of that of the previous instar (see below).
  3. The only exception to this rule is the final mass of the last larval instar, which is substantially larger than expected.


  1. We have found that a close approximation of the growth exponent, k, can be obtained from the growth rate on day 3 and the initial weight of the instar.
  2. The relationship is best fit by a logarithmic regression where k = 0.2*ln( GR) + C, where C is a constant that depends on the initial weight of the instar.


  1. That is, the final mass of each is a constant multiple of the final mass of the previous instar.
  2. The pupa is a reduced version of the hemimetabolous nymph, in the sense that it has only one instar, rather than multiple, as the nymph does.


  1. Although the growth exponent decreases gradually from instar to instar, the size increment from instar to instar is constant.
  2. Clearly, the overall growth during the fifth instar is not exponential but resembles a rather flat sigmoid.
  3. Regression of the exponent value on instar number (Figure 3b inset) shows that the growth exponent declines approximately linearly from instar to instar.
  4. Drosophila optic lobe development, structures in the 3rd instar Compound eyes of holometabolic insects are structures of the adult animal.


  1. Nature > Life > Animals > Arthropods
  2. Nature > Life > Animals > Insects
  3. Glossaries > Glossary of Developmental Biology /
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