All members of Curculio have characteristically long rostrums and ovipositors, an adaptation that specifically developed by their reliance on seeds for food and reproduction.

[3] The larvae are short, and cylindrical in shape, and move by means of ridges on the underside of the body.

[4] Curculio glandium eggs are deposited in acorns by the adult weevil chewing channels into the fruit.

The eggs are then released using an ovipositor, a long, narrow organ featured in female weevils.

[2] These do not reach the acorn's embryo and are healed by the plant, sealing the holes and protecting the eggs from parasites.