hypopus

Japanese: hypopus
hypopus

…Acarid mites generally consist of five stages: eggs, juvenile mites, pre-nymphs, post-nymphs, and parent mites. However, when the environment deteriorates, the pre-nymphs turn into migratory mites called hypopus, and when the environment improves again, some turn into post-nymphs. If the environmental conditions are good, it takes about two weeks for eggs to develop into parent mites. …

From [Mite (蜱, 蟎, 壁蝨)]

…The number of days it takes for eggs to develop into adults varies greatly depending on the species, but under good conditions it takes about 10 days for dust mites, 2 weeks for house mites, about a month for ticks, and about 3 months for chiggers and oribatid mites. Some dust mites develop a special stage called the hypopus (migratory nymph) during development, which is highly resistant to low temperatures, high temperatures, dryness, and chemicals.
[Appearance and Adaptation on Earth]
The oldest known tick fossils are from Devonian deposits in eastern Scotland.

*Some of the terminology that mentions "hypopus" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…コナダニ類は一般に卵,幼ダニ,前若ダニ,後若ダニ,親ダニの5期からなる。しかし,環境が悪くなると前若ダニはヒポプスhypopusと呼ばれる移動性若ダニに変化し,再び環境がよくなると後若ダニに変化するものがある。卵から親ダニに発育するまでの期間は環境条件がよければ2週間前後である。…

【ダニ(蜱∥蟎∥壁蝨)】より

…卵から成虫になるまでの日数は種類によっておおいに異なり,条件さえよければコナダニでは10日あまり,イエダニでは2週間,マダニでは1ヵ月前後,ツツガムシやササラダニでは3ヵ月くらいを要する。コナダニのあるものでは,発育段階の途中でヒポプス(hypopus,移動若虫)という特別な段階が出現することがあり,これは低温,高温,乾燥,薬剤などに強い抵抗性を示す。
[地球上への出現と適応]
 ダニのもっとも古い化石はスコットランド東部のデボン紀の地層から発見されている。…

※「hypopus」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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