AskDefine | Define hemimetabolous

Dictionary Definition

hemimetabolous adj : (of an insect with aquatic young) undergoing incomplete metamorphosis in which the young does not resemble the adult [syn: hemimetabolic, hemimetamorphous, hemimetamorphic]

Extensive Definition

Hemimetabolism or hemimetaboly, also called incomplete metamorphosis, is a term used to describe the mode of development of certain insects that includes three distinct stages: the egg, nymph, and the adult stage, or imago. These groups go through gradual changes; there is no pupal stage. The nymph often resemble the adult somewhat, as they have compound eyes, developed legs and wing stubs visible on the outside.

Previously used nomenclature

Hemimetabolous insects used to be further divided into two categories: paurometaboly and heterometaboly. In paurometabolous insects, the 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 naiad live in the water and cicada nymph underground, whereas the adults are aerial.

Terminology of aquatic entomology

In aquatic entomology, different terminology is used when categorizing insects with incomplete metamorphosis. Paurometabolism refers to insects whose nymphs occupy the same environment as the adults, as in the family Gerridae of hemiptera. The hemimetabolous insects are those whose nymphs, called 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

hemimetabolous in Bosnian: Nekompletna metamorfoza
hemimetabolous in Estonian: Vaegmoone
hemimetabolous in Spanish: Hemimetabolismo
hemimetabolous in French: Paurométabole
hemimetabolous in Icelandic: Ófullkomin myndbreyting
hemimetabolous in Hebrew: בעלי גלגול חסר
hemimetabolous in Dutch: Onvolledige gedaanteverwisseling
hemimetabolous in Norwegian: Hemimetabole insekter
hemimetabolous in Norwegian Nynorsk: Hemimetaboli
hemimetabolous in Polish: Przeobrażenie niezupełne owadów
hemimetabolous in Simple English: Incomplete metamorphosis
hemimetabolous in Chinese: 半变态
Privacy Policy, About Us, Terms and Conditions, Contact Us
Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2
Material from Wikipedia, Wiktionary, Dict
Valid HTML 4.01 Strict, Valid CSS Level 2.1