How to distingush insect larvae
Weevil larvae can easily be confused with the immature stage
of other insects such as caterpillars that feed on foliage
and the larvae of beetles, sawflies, and true flies. Larvae
can be distinguished by the number and arrangement of their
appendages. Filbertworm larvae have three pairs of true legs.
Filbert weevil larvae have no obvious legs. Caterpillars
and larvae of beetles and sawflies have three pairs of true
legs, one pair on each thoracic segment. Most sawfly larvae
also have fleshy protuberances or leglike appendages (called
prolegs) on all of their abdominal segments. Caterpillars
have prolegs on some abdominal segments, but never on the
first two abdominal segments. Beetle larvae have true legs,
but no prolegs. Fly larvae (such as predatory syrphids) have
no true legs. Fly larvae can have either smooth bodies or
fleshy protuberances, which can be just on their abdomen
or on both their abdomen and thorax. | 
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