Dipterous insect and Dipteran

Dipterous insect noun - Insects having usually a single pair of functional wings (anterior pair) with the posterior pair reduced to small knobbed structures and mouth parts adapted for sucking or lapping or piercing.

Dipteran is a synonym for dipterous insect. In some cases you can use "Dipteran" instead a noun phrase "Dipterous insect".

Dipteran noun - Insects having usually a single pair of functional wings (anterior pair) with the posterior pair reduced to small knobbed structures and mouth parts adapted for sucking or lapping or piercing.

Dipterous insect is a synonym for dipteran. You can use "Dipterous insect" instead a noun "Dipteran".