Vestigial synonyms

Heider bryonic membranes are vestigial or entirely wanting.

In some Psocidae the wings are in a vestigial state, and the fully winged species rarely if ever fly.

The proboscis-pores are highly variable, and frequently only one is present, that on the left side; sometimes the pore-canals of the proboscis unite to open by a common median orifice, and sometimes their communication with the probosciscoelom appears to be occluded, and finally the pore-canals may be quite vestigial.

In the Achorutidae the head is forwardly directed, the tergum of the prothorax conspicuous, and the spring small or vestigial.