(Of an insects) having no wings.
- The presence of a fundatrix, the numbers of soldiers, nonsoldier nymphs, apterous adults (all instars), and alates were recorded.
- Prey items were separated into morphotypes based on order, life stage (adult/larva), and in the case of Hymenoptera, apterous or winged.
- As originally described, Liassothrips is either a nymph or an apterous adult.
Late 18th century: from Greek apteros (from a- 'without' + pteron 'wing') + -ous.
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