1) Animal order 2) Corrodentia 3) Order corrodentia 4) Order psocoptera 1) Corrodentia 
Psocoptera are an order of insects that are commonly known as booklice, barklice or barkflies. They first appeared in the Permian period, 295–248 million years ago. They are often regarded as the most primitive of the hemipteroids. Their name originates from the Greek word ψῶχος, psokos meaning gnawed or rubbed and πτερά, ptera meanin...
[n] - an order of insects: includes booklice and barklice
the Psocoptera (or booklice and barklice) are an Order of insects. They are small insects but, despite being called lice, are not parasites.
order Psocoptera noun an order of insects: includes booklice and bark-lice