A proleg is a small, fleshy, stub structure found on the ventral surface of the abdomen of most larval forms of insects of the order Lepidoptera, though they can also be found on other larval insects such as sawflies and a few types of flies. In all the orders in which they appear, mainly Hymenoptera and Lepidoptera, prolegs of any form evolved independently of each other by convergent evolution.
Prolegs of lepidopteran larvae have a small circle of gripping hooks, called "crochets". The arrangement of the crochets can be helpful in identification to family level. Although the point has been debated, prolegs are not widely regarded as true legs, derived from the primitive uniramous limbs. Certainly in their morphology they are not jointed, and so lack the five segments (coxa, trochanter, femur, tibia, tarsus) of thoracic insect legs. Prolegs do have limited musculature, but much of their movement is hydraulically powered.
NARRATOR
Once upon a time,
In a far away land,
A young Prince lived in a shining castle.
Although he had everything his heart desired,
the Prince was spoiled, selfish and unkind.
But then, one winter's night,
an old beggar woman came to the castle
and offered him a single rose
in return for shelter from the bitter cold.
Repulsed by her haggard appearance,
the Prince sneered at the gift,
and turned the old woman away.
But she warned him not to be deceived by appearances,
for Beauty is found within.
And when he dismissed her again,
the old woman's ugliness melted away to reveal a beautiful enchantress.
The prince tried to apologize,
but it was too late, for she had seen that there was no love in his heart.
And as punishment, she transformed him into a hideous beast
and placed a powerful spell on the castle and all who lived there.
Ashamed of his monstrous form,
the Beast concealed himself inside his castle,
with a magic mirror as his only window to the outside world.
The rose she had offered was truly an enchanted rose,
which would bloom until his twenty-first year.
If he could learn to love another,
and earn their love in return by the time the last petal fell,
Then the spell would be broken.
If not, he would be doomed to remain a beast for all time.
As the years passed,
he fell into despair and lost all hope,
For who could ever learn to love .... a beast?