Meal worm's life cycle is 3-5 months. First it is a tiny white egg which will hatch in about 1-2 weeks. The next stage is a larva. It is a worm-like creature but only has 6 legs. It will stay in this stage for 3 - 4 weeks.Then it turns into a pupa. It is yellowish-brown. The mealworms are inactive at this stage. Finally it turns into a beetle. First the beetle is white, sowly turns brown, and then finally black. The beetle will eventually die and the life cycle will start all over again. A female can lay up to 500 eggs in her lifetime.
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Pretty much the same as all beetles. The time for one cycle depends on temperature but is usually several months unless they are very warm. Adults lay eggs over a couple of months, they hatch in about 2-3 weeks. The larvae feed on vegetable matter - in culture they are provided with cereal-based feed. They moult several times and then pupate without a pupal case. Freshly moulted worms and beetles are white but as the skin/exoskeleton hardens, they turn brown. Beetles start to lay around a week after emergence. They are unusual as they cannot fly - they have fused elytra. Which adds to their attraction as subjects for culture and use as a food for captive insectivores.
There are 4-stages in the life cycle of the mealworm. Actually mealworm is the young of the beetles. Its' young is a worm and do not look like the adult, so the third stage is the pupa ( the worm transfer into a beetle inside it).
By the meal worm beetle, I assume you are refering to the Tenebrio Molitor. Now back to your question, there has been finding of Tenebrio Molitor's from as eairly as 1,846 AD still alive today. A standard North American Worm Tick Beetle might only live up to 5 weeks though. Hope this helps.