Hemimetabolism
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218755366
2008-06-12T00:54:23Z
TXiKiBoT
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robot Adding: [[zh-yue:唔完全變態]]
'''Hemimetabolism''' or '''hemimetaboly''', also called '''incomplete [[Metamorphosis (biology)|metamorphosis]]''', is a term used to describe the mode of development of certain insects that includes three distinct stages: the [[egg (biology)|egg]], [[Nymph (biology)|nymph]], and the adult stage, or [[imago]]. These groups go through gradual changes; there is no [[pupa|pupal]] stage. The nymph often resemble the adult somewhat, as they have compound eyes, developed legs and wing stubs visible on the outside.
==Examples of hemimetabolous insects==
*[[Hemiptera]] ([[scale insect]]s, [[aphids]], [[whitefly]], [[cicadas]], [[leafhopper]]s and true bugs)
*[[Orthoptera]] ([[grasshopper]]s and [[crickets]])
*[[Mantodea]] ([[praying mantis]]es)
*[[Blattaria]] ([[cockroach|cockroaches]])
*[[Dermaptera]] ([[earwigs]])
*[[Odonata]] ([[dragonflies]] and [[damselflies]]).
==Previously used nomenclature==
Hemimetabolous insects used to be further divided into two categories: '''paurometaboly''' and '''heterometaboly'''. In paurometabolous insects, the [[nymph (biology)|nymph]] and the adult would live in the same environment (water, air, soil, etc.). This is the case of the [[Orthoptera]] (grasshoppers and crickets) and some [[Hemiptera]] (true bugs) are examples of this. The nymph and adult of heterometabolous insects live in different environments. For example, [[Odonata]] naiads live in the water and cicada nymphs underground, whereas the imagos are aerial.
==Terminology of aquatic entomology==
In aquatic [[entomology]], different terminology is used when categorizing insects with incomplete [[metamorphosis (biology)|metamorphosis]]. Paurometabolism refers to insects whose [[nymph (biology)|nymphs]] occupy the same environment as the adults, as in the family [[Gerridae]] of [[hemiptera]]. The hemimetabolous insects are those whose nymphs, called [[Naiad_%28biology%29|naiads]], occupy aquatic habitats while the adults are terrestrial. This includes all members of the orders [[Plecoptera]], [[Ephemeroptera]], and [[Odonata]]. Aquatic entomologists use this categorization because it specifies whether the adult will occupy an aquatic or semi aquatic habitat, or will be terrestrial. This classification system is similar to previously used nomenclature in terrestrial entomology.
==See also==
*[[Holometabolism]]
*[[Ametabolism]]
*[[Metamorphosis (biology)|Metamorphosis]]
[[Category:Entomology]]
[[Category:Developmental biology]]
[[bs:Nekompletna metamorfoza]]
[[et:Vaegmoone]]
[[es:Hemimetabolismo]]
[[fr:Paurométabole]]
[[is:Ófullkomin myndbreyting]]
[[he:בעלי גלגול חסר]]
[[nl:Onvolledige gedaanteverwisseling]]
[[no:Hemimetabole insekter]]
[[nn:Hemimetaboli]]
[[pl:Przeobrażenie niezupełne owadów]]
[[simple:Incomplete metamorphosis]]
[[zh-yue:唔完全變態]]
[[zh:半变态]]