How to know if it's a caterpillar or a larva?.
Caterpillars may have up to five pairs of abdominal prolegs.
Sawfly larvae will have six or more pairs of abdominal prolegs.
Another, less obvious difference between caterpillars and sawfly larvae
is the number of eyes.
Caterpillars almost always have 12 stemmata, 6 on
each side of the head.
Sawfly larvae usually have just a single pair of
stemmata.
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