Conotrachelus posticatus is a species of true weevil within the beetle family Curculionidae. C. posticatus is found in North America. It is on average 3.7–5 mm (0.15–0.20 in) long and is found from North America (particularly in Minnesota, Florida, and Texas) to Panama. It breeds in acorns and its larvae are found within them and use them as food. C. posticatus has had a growing presence within oak trees, which they attack by destroying seeds within the tree.Their activity in relation to oak trees and forest ecosystems is not yet fully understood.

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