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Many Hexapoda have lost either one pair or both pairs of wings; cases are common of wingless genera allied to ordinary Pterygote genera.

But the word “Insect” had become limited since the days of Linnaeus to the Hexapod Pterygote forms, to the exclusion of his Aptera.

Lamarck, however, appears not to have insisted on this name Hexapoda, and so the class of Pterygote Hexapods came to retain the group-name Insecta, which is, historically or etymologically, no more appropriate to them than it is to the classes Crustacea and Arachnida.

Apterygota: = apterygogenea; see pterygote.