Instar

Instar

An instar is a developmental stage of arthropods, such as insects, between each moult ("ecdysis"), until sexual maturity is reached. 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 or changes in the number of body segments. Some arthropods can continue to molt after sexual maturity, but these subsequent molts are generally not called instars.

For most insect species the term "instar" is used to denote the developmental stage of the larval or nymphal forms of holometabolous (complete metamorphism) or hemimetabolous (incomplete metamorphism) insects, but the term can be used to describe any developmental stage including pupa or imago (the adult, which does not molt in insects). The number of instars an insect completes depends on the species and the environmental conditions. Cooler temperatures and lower humidity often slow the rate of development.


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  • instar (à l') — (a lin star) loc. prépos. À la manière de, à l exemple de, de même que. •   À l instar du culte évangélique, il [Julien] essaya d unir la morale à la religion, CHATEAUBR. Génie, I, 1, 1. REMARQUE    À l instar est une préposition décriée, dit… …   Dictionnaire de la Langue Française d'Émile Littré

  • instar — (à l instar de) [ alɛ̃stardə ] loc. prép. • 1564; adapt. loc. lat. ad instar, de instar « valeur égale » ♦ Littér. À l exemple, à la manière de, de même que. ⇒ comme. « une pièce en un seul acte, à l instar des tragiques grecs » (Montherlant).… …   Encyclopédie Universelle

  • instar de (à l') — [alɛ̃staʀdə] loc. prép. ÉTYM. 1569; adapt. de la loc. lat. ad instar « à la ressemblance », de instar « valeur égale ». ❖ ♦ À l exemple, à la manière de, de même que. ⇒ Comme; image (à l ), imitation (à l ) …   Encyclopédie Universelle

  • instar — /instar/ Likeness; the likeness, size, or equivalent of a thing. Instar dentium, like teeth. Instar omnium, equivalent or tantamount to all …   Black's law dictionary

  • instar — /instar/ Likeness; the likeness, size, or equivalent of a thing. Instar dentium, like teeth. Instar omnium, equivalent or tantamount to all …   Black's law dictionary

  • instar — com o pai instou com o filho. instar para que instaram para que voltasse …   Dicionario dos verbos portugueses

  • Instar — In star , n. a postembryonic stage of life of an arthropod, especially an insect, between two successive molts; also, the arthropod when in that stage of life. [PJC] …   The Collaborative International Dictionary of English

  • Instar — In*star , v. t. To stud as with stars. [R.] A golden throne instarred with gems. J. Barlow. [1913 Webster] …   The Collaborative International Dictionary of English

  • instar — instar. См. период между линьками. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • instar de — (à l ) loc. Prép. à l exemple de …   Encyclopédie Universelle

  • instar — ‘Pedir con apremio [a alguien] que haga algo’. Como otros verbos de influencia (→ leísmo, 4b), lleva un complemento directo de persona y un complemento con a: «Lo instó a que dijera lo que quería decir» (GaMárquez Amor [Col. 1985]). En el habla… …   Diccionario panhispánico de dudas

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