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Zoraptera Zorapterans / Angel Insects The name Zoraptera, derived from the Greek "zor" meaning pure and "aptera" meaning wingless, was given to the order before winged forms were discovered. |
Classification & Distribution
- incomplete development (egg, nymph, adult)
- closely related to Orthoptera, some entomologists believe they may represent an evolutionary link between the orthopteroids and the hemipteroids (particularly Psocoptera).
Hemimetabola
Orthopteroid
Distribution: Rare. Usually found only in association with rotting wood or piles of aged sawdust. Known to occur in all biogeographic regions except the Palearctic.
North America
Worldwide Number of Families 11Number of Species 230Life History & Ecology
Members of the order Zoraptera are small (less than 4 mm) and usually found in rotting wood, under bark, or in piles of old sawdust. They live in small aggregations and appear to scavenge on spores and mycelium of fungi, or occasionally, on mites and other small arthropods. Little more is known about their biology. Some Zoraptera are blind, pale in color, and wingless, while other members of the same species may be darkly pigmented with compound eyes and wings. The winged individuals are rather uncommon; they may be dispersal forms. The wings break off easily near the base, leaving only stubs.
Physical Features
AdultsImmatures- Antennae 9-segmented
- Mouthparts mandibulate, hypognathous
- Soft-bodied, small (usually less than 3 mm)
- Wings often absent, with reduced venation when present
- Tarsi 2-segmented
- Cerci one-segmented
- Structurally similar to adults
- Always wingless
Economic Importance
The Zoraptera do not have any economic significance. They are rarely collected.
Major Families
- Zorotypidae -- this single family includes all known species of Zoraptera.
Bug Bytes
- Zoraptera is the third smallest insect order. Only Mantophasmatodea and Grylloblattodea contain fewer species.
- Some species of Zoraptera have been found living in the nests of termites and mammals. No one is sure what these insects are doing there.
- In most Zoraptera, there are two forms of adults: winged individuals are usually brown in color and have both eyes and ocelli, wingless individuals are usually blind and pale (unpigmented) in color.
