protos - first , oura- tail.
- antennae absent
- tentorium absent
- fore legs enlarged, with many sensilla; front legs serve role of antennae
- very small, less than 2 mm long
- abdomen with 12 segments as adult
- Mouth parts entognathous
- cerci absent
- legs 5-segmented
- anamorphic development (segments added at moults) vs. epimorphic in all other hexapods
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