 |
Primarily wingless insects (very primitive with very
little metamorphosis) containing 4 orders. When we say primarily
wingless we mean that as far as we know these insects never had wings at
any time in the past. Some insects which are now wingless are in the
Pterygota (winged) section
because we believe they have evolved from insects which had wings in the
past, we call this being secondarily wingless, fleas are an example of a
secondarily wingless insect. |