Mealworms

Mealworms are the larval form of the mealworm beetle, Tenebrio molitor, a species of. Like all s, they go through four life stages:, , , and. Larvae typically measure about 2.5 cm or more, whereas adults are generally between 1.25 and 1.8 cm in length.

Reproduction
The mealworm beetle breeds prolifically. Mating is a three-step process: the male chasing the female, mounting her and inserting his, and injecting a sperm packet. Within a few days the female burrows into soft ground and lays about 500 eggs.

After four to 19 days the eggs hatch. Many predators target the eggs, including reptiles.

During the larval stage, the mealworm feeds on vegetation and dead insects and between each larval stage, or  (9 to 20 instars). After the final molt it becomes a. The new pupa is whitish, and it turns brown over time. After 3 to 30 days, depending on environmental conditions such as temperature, it emerges as an adult beetle.

Sex pheromones
A sex released by male mealworms has been identified. reduces the attractiveness of sexual pheromone signaling by male mealworms. Females are more attracted to the odors produced by males than the odors produced by inbred males. The reduction of male signaling capability may be due to increased expression of homozygous deleterious recessive alleles caused by inbreeding.

Relationship with humans
Tenebrio molitor is often used for biological research. Its relatively large size, ease of rearing and handling, and status as a non- make it useful in studies in the fields of basic biology, biochemistry, evolution, immunology and physiology.

As pests
Mealworms have generally been considered pests, because their larvae feed on stored grains. Mealworms probably originated in the region, but are now present in many areas of the world as a result of human trade and colonization. The oldest archaeological records of mealworms can be traced to. Records from the British Isles and northern Europe are from a later date, and mealworms are conspicuously absent from archaeological finds from ancient.

As food
Mealworms are edible for humans, and are commonly consumed in a practice known as. Mealworms have historically been consumed in many Asian countries, particularly in Southeast Asia. They are commonly found in food markets and sold as street food alongside other edible insects. Baked or fried mealworms have been marketed as a healthy snack food in recent history, though the consumption of mealworms goes back centuries. They may be easily reared on fresh oats, wheat bran or grain, with sliced potato, carrots, or apple as a moisture source. The small amount of space required to raise mealworms has made them popular in many parts of Southeast Asia.

Mealworms have been incorporated into -flavored novelty candies. Mealworms are not traditionally served in tequila, and the "tequila worm" in certain s is usually the larva of the .

Mealworms are typically used as a for captive s,,  and s. They are also provided to wild birds in s, particularly during the nesting season. Mealworms are useful for their high protein content. They are also used as.

They are commercially available in bulk and are typically available in containers with or  for food. Commercial growers incorporate a into the feeding process to keep the mealworm in the larval stage and achieve an abnormal length of 2 cm or greater.

Nutrient composition
Mealworm larvae contain significant nutrient content, a feature that has made them viable as food and feed. For every 100 grams of raw mealworm larvae, 206 calories and anywhere from 14 to 25 grams of protein are contained. Mealworm larvae contain levels of potassium, copper, sodium, selenium, iron and zinc that rival that of beef. Mealworms contain essential linoleic acids as well. They also have greater vitamin content by weight compared to beef, B12 not included.

In waste disposal
In 2015, it was discovered that mealworms can degrade into usable organic matter at a rate of about 34-39 milligrams per day. Additionally, no difference was found between mealworms fed only styrofoam and mealworms fed conventional foods, during the one-month duration of the experiment. Microorganisms inside the mealworm's gut are responsible for degrading the polystyrene, with mealworms given the  showing no signs of degradation. Isolated colonies of the mealworm's gut microbes, however, have proven less efficient at degradation than the bacteria within the gut. No attempts to commercialize this discovery have been made.[]