Hemimetabolism

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Related to hemimetabolous: holometabolous, hemimetabolous metamorphosis

Hemimetabolism

 

incomplete metamorphosis, a type of postembryonic development in insects of several systematic groups (such as dragonflies, mayflies, stone flies, Orthoptera, and Hemiptera). From the eggs come larvae (nymphs), which outwardly are similar to mature insects in that they have faceted eyes and a jointed tarsus, as well as mouth organs just as an adult does. Various orders of insects in the post-embryonic stage have from three to 30 nymph stages. Metamorphosis of the nymph into an adult insect takes place without the chrysalis stage. Sometimes the term “hemimetabolism” is used only for the development of the dragonfly, mayfly, and stone fly, which in the nymph stage have provisional or temporary organs (branchiae, masks); the development of other insects with incomplete metamorphosis, in which the larvae lack provisional organs, is called “paurometabolism.” The opposite of hemimetabolism is holometabolism.

M. S. GILIAROV

References in periodicals archive ?
Of note is that females of other hemimetabolous species also tend to have longer antennae than males (Chinta et al.
Their taxon sample was comprised of 32 exemplars representing all orders of Holometabola, including 8 beetles in as many families (and representing all 4 suborders), 2 Strepsiptera, and 2 hemimetabolous insect outgroups.
Functions of the ecdysone receptor isoformA in the hemimetabolous insect Blattella germanica revealed by systemic RNAi in vivo.