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| Strepsipterans
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Mengenillidae Mengeidae Stylopidae Bohartillidae Corioxenidae Halictophagidae Callipharixenidae Elenchidae Myrmecolacidae
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Male Strepsiptera have wings, legs, eyes, and antennae, and look like ordinary insects, though they generally have no useful mouthparts. Females never leave their hosts, except in the Mengenillidae, and have no wings. Females of some species show neoteny.
Strepsipteran eyes are unlike those of any other insect. Instead of compound eyes consisting of hundreds of ommatidia, each of which sees one pixel, the strepsipteran eyes consist of a few dozen lenses, each with its own individual retina.
The order is named for the hind wings, which are held at a twisted angle when at rest. The forewings are reduced to halteres.
Strepsiptera present an enigma to taxonomists. Some believe they are the sister group to the beetle families Meloidae and Rhipiphoridae , which have similar parasitic development and forewing reduction; some say they are the sister group to the beetles; some say they are the sister group to the flies, which have hindwing halteres.