Mealworms are the larval form of the mealworm beetle, Tenebrio molitor, a species of darkling beetle. Despite their name, mealworms are beetle larvae rather than worms.
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Like all holometabolic insects, they go through four life stages: egg, larva, pupa, and adult.
Larvae typically measure about 2.5 cm or more, whereas adults are generally between 1.25 and 1.8 cm in length.