Apterygota

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Apterygota

or

Ametabola

a subclass of primitive insects that have never evolved wings, and that undergo little or no METAMORPHOSIS. There is little change in form from INSTAR to instar. The subclass includes silverfish (Thysanura), springtails (Collembola), and Protura. Compare PTERYGOTA.
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1998b) suggested that the Carboniferous examples were most likely the result of a combination of locomotion and feeding of apterygotes.
Whereas Smith (1909) did not offer a trace maker and Walker (1985) suggested only an arthropod producer, Buatois et al (1998b) tentatively attributed the Carboniferous examples to apterygote insects due to their close association with the body imprint Tonganoxichnus ottawensis.
Traces attributed to apterygote insects, arthropleurid myriapods, bivalved arthropods and vermiform animals occur in lake-margin sediments in association with those of temnospondyl amphibians and early diapsid reptiles, and belong to the Scoyenia ichnofacies.