Hypopus

Hypopus

The hypopus (plural hypopi or hypopodes) is a modified juvenile stage of acaridid mites. It corresponds to the deutonymph, the second of up to three nymphal stages. This stage is a facultative and may or may not be present in the life-cycle of the mites, depending on environmental conditions (food availability, humidity) and density-dependent factors (overcrowding).

The hypopus is morphologically and behaviourly very different from other instars: there are no functional mouthparts, the body is sucker-shaped, smooth, with a thick cuticle. They are more apt to resist bad environmental conditions, such as desiccation. Also, in many cases they are used for dispersal. This is achieved through phoresy, the hypopus attaching to a passing animal, often an insect, with suckers or grasping organs.


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  • Hypopus — Hypopus, Gattung der Eigentlichen Milben …   Pierer's Universal-Lexikon

  • hypopus — n.; pl. hypopi [Gr. hypo, under; pous, foot] (ARTHROPODA: Chelicerata) 1. In Acari, the second nymphal stage. 2. The non feeding deutonymph of Acaridida; either active, phoretic nymphs or rather inactive resistant nymphs; hypop(i)al adj …   Dictionary of invertebrate zoology

  • hypopus — hyp·o·pus hip ə pəs n, pl hyp·o·pi .pī a migratory larva of some mites that is passively distributed by an animal to which it has attached itself and on which it does not feed * * * hy·po·pus (hi poґpəs) a stage in the development of certain …   Medical dictionary

  • hypopus — hyp·o·pus …   English syllables

  • hypopus — …   Useful english dictionary

  • hypopial — (ˈ)hī|pōpēəl, hə̇ˈp adjective Etymology: New Latin hypopus + English ial : of, relating to, or consisting of a hypopus …   Useful english dictionary

  • Woodland jumping mouse — Temporal range: Middle Pleistocene to Recent Conservation status …   Wikipedia

  • Переселение животных — (миграция) представляет обычное явление в жизни животных. В широком смысле слова миграция состоит в том, что животное, способное перемещаться по земле, воде или воздуху, не остается постоянно на одном и том же месте, но хотя бы временно переходит …   Энциклопедический словарь Ф.А. Брокгауза и И.А. Ефрона

  • elattostase — n. [Gr. elatton, smaller; stasis, position] (ARTHROPODA: Chelicerata) A rare stase of prelarva or larva in which the mouthparts are subject to regression in that though the mouthparts are intact, they are unable to function, or the lack of… …   Dictionary of invertebrate zoology

  • hypopi — pl. hypopus …   Dictionary of invertebrate zoology

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