Mealworms are great for chooks, fish or reptiles (and blog authors…) to snack on. They’re easy to breed and need relatively little care, preferring to get on with their lives in relative darkness.
What are Mealworms?
Mealworms are the larval stage of a black beetle called ‘Darkling Beetle’, Tenebrio molitor.
In the wild, the beetles can be found in warm and dark environments such as beneath logs. Its genus name, ‘Tenebrio‘ means ‘one who likes darkness’.
Darkling Beetles are scavengers who feed on decomposing plant or animal material. In man made environments, they can be a pest, living where we store grains and grain which they’ll happily eat (and they eat a lot).
The Adult Beetle Stage
The Darkling Beetle is an holometabolic insect (yes, I had to look that one up) meaning that has distinct forms during each stage of its lifetime. Tenebrio molitor has an egg, a larval, a pupal and an adult (beetle) form.
The Egg Stage
I couldn’t take any decent photos of mealworm eggs. They’re tiny and white and sticky, forming little clumps. The eggs can take on some of the coloration of the material in which they were laid.
The female beetle lays 100 to 200 eggs at a time and up to 500 over her lifetime. The eggs then take from 4 to 19 days to hatch. In the conditions found in most homes, it will take about a week for them to hatch, into larvae.
The Larval Stage
This stage is what most folks are familiar with and call a ‘mealworm’.
Mealworms start off very light brown or creamy color and darken as they age. This stage takes 3 – 10 weeks. Mealworms are very active and feed on a variety of foods. They molt up to 20 times as their innards outgrow their exoskeletons. storing up energy for the next stage. After the last molt, the larvae normally darken, curl up and change form, becoming pupae.
The Pupal Stage
This stage of the lifecycle lasts for a period of 2 – 3 weeks but it may be longer in cold conditions. During this stage, the pupae seem inactive but inside their hard shell, all of the complex structures of the adult beetle are forming.
They can mate and lay eggs within two weeks and live for a couple of months.
There you go, a brief overview of the life cycle of a mealworm. If you’re interested in breeding up your own for yourself or your pets, don’t forget to look at our other mealworm page about building a Mealworm Tower
Don’t just take my word for it, here’s a link to a page chock full of Darkling Beetle Fun Facts