Mealworms are the larval form of the mealworm beetle, Tenebrio molitor, a species of darkling beetle.
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.
The mealworm beetle breeds prolifically.
Mating is a three-step process: the male chasing the female, mounting her and inserting his aedeagus, and injecting a sperm packet.
Within a few days the female burrows into soft ground and lays about 500 eggs. (source)
So can hamsters eat live mealworms?
Yes they can in small amounts in moderation. Just make sure they are purchased from a reputable store.