Hexapoda mostly with wings, the wingless forms clearly degraded.
Many species are wingless at all ages.
The females are always wingless, but are provided with antennae, legs and well-developed mouth-parts.
It has roundish cones, with numerous scales and wingless seeds.
All the known forms of plant-life are either fungi or allied to them, and many are only microscopic. The most interesting inhabitants of Mammoth Cave are the blind, wingless grasshoppers, with extremely long antennae; blind, colourless crayfish (Cambarus pellucidus, Telk.); and the blind fish, Amblyopsis spelaeus, colourless and viviparous, from 1 in.