What does a leather beetle larva look like, why is it dangerous in an apartment, and how to get rid of such larvae?

The skin beetle larva is the main pest among all the skin beetles in the apartment. The fact is that in most species of beetles of the leather beetle family, adult individuals do not feed at all. That is, black, gray, or spotted beetles, which can often be found on window sills (they fly into apartments from the street) or on beds, do not gnaw, eat, damage, or cause any harm. But it is the larvae that are truly harmful, capable, in fact, of gnawing almost any organic substance.

For example, in the photo below are the larvae of the ham leather beetle, which can render any fur coat or leather product unusable:

And these are the carpet beetle larvae, just as voracious, but slightly less common in apartments than the previous ones:

You have probably already noticed that these larvae are not quite similar to the caterpillars we are used to. For most people not immersed in biology, the word “larva” is associated with the concept of “caterpillar”, or even “worm”. From a scientific point of view, this is incorrect, but at the everyday level it is quite convenient. The larva of the carpet beetle does not resemble either a caterpillar or a worm. And this is often associated with very real everyday problems: having encountered such a creature in an apartment, a person does not always perceive it as a pest, does not begin to fight these larvae in time, and over time there are so many of them that they begin to spoil very expensive things.

Fortunately, skin beetle larvae have qualities that allow you to get rid of them quickly enough. Therefore, let's figure out how to identify these pests in the apartment, how to find them and how to quickly get them out before they spoil something.

What does a carpet beetle larva look like?

The main distinguishing feature of the larvae of almost all skin beetles is the presence of a large number of long, stiff hairs on the body. In some species, this “fur” is so thick that it hides the body itself.

For example, this is what a mullein beetle larva looks like:

To an inexperienced eye, it may seem that the insect does not even have the characteristic worm-like body shape, but looks more like a tuft of fur.

In fact, the larvae of skin beetles have the same body shape as the larvae of other beetles. It’s just that this body is hidden behind thick hairs that form a very unique outfit.

In larvae of skin beetles of different species, the density and length of hairs on the body vary significantly. Thus, in carpet beetle larvae, the body itself is clearly visible and it is clear that they are to some extent similar to caterpillars:

And in the house leather beetle, the larvae are so shaggy that the body is not visible, and the hairs on the back of it form a kind of “tail”, the length of which is commensurate with the length of the body:

On a note

It is incorrect to call the larvae of skin beetles either caterpillars or worms. Caterpillars in science are called butterfly larvae; they have very characteristic features of the body structure that the larvae of skin beetles do not have. For example, butterfly larvae have several pairs of false legs on the back of the body, with which they can grasp branches or other supports. The larvae of beetles (including leather beetles) do not have false legs. The larvae of skin beetles have even less in common with worms - the worms themselves belong to a completely different class and even type of living creatures, and the similarities between them and the larvae of skin beetles end with the elongated shape of the body.

By the way, the hairs on the body of the larvae become thicker and longer as the larva itself grows and develops. Immediately after hatching from the egg, the larva is small, thin and almost naked - there are hairs on its body, but they are sparse and thin.

This photo, for example, shows what newly hatched carpet beetle larvae look like:

As the larva grows and feeds, its “fur” becomes thicker, longer, and in some species completely hides the insect’s body underneath, as if under a fur coat. This is what the last instar larva of the skin beetle looks like:

Be that as it may, it is the thick hairs on the body of the skin beetle larva that are the main identifying feature that allows you to distinguish it from any other insects living in the apartment. Due to such hairs, the appearance of the larva is so unique that once you see and identify it, you will no longer be able to confuse it with any other pest.

Mosquito breeding

There are four main development cycles in the life of these insects:

1. An egg that matures in 2 to 8 days
2. A blood-sucking larva that lives in water bodies and feeds on microorganisms found in it. The larvae breathe air using special breathing tubes. During their entire development, the larvae molt 4 times, and after that they turn into a pupa,
3. Development of the pupa, which lasts up to 5 days. As the pupa grows, it changes color and becomes black.
4. The imago stage, which implies an adult insect that already lives on land.

The males arrive first. They form a swarm and wait for females to mate. This type of reproduction is called “eurygamy”. It is worth noting that the bloodsuckers living in the city have learned to mate without forming a swarm. When the female is already fertilized, she goes for a portion of blood. After that, she lays eggs, and the cycle begins again.

The sizes of these insects

The size of skin beetle larvae varies from half a millimeter at the stage of emerging from the egg to 9-12 mm before pupation in some species. Of course, the maximum body length of a larva depends on the size of the adult beetle: in species whose imagoes have a body length of 2-3 mm, the larvae grow to 4-5 mm, and in species whose beetles grow up to 8-9 mm, the larvae can reach up to 12 mm, and taking into account the length of the posterior hairs - 15.

In the photo, for example, it is noticeable that the unique “tail” of the skin beetle larva is not inferior in length to the body size of the larva itself:

In any case, the larvae of skin beetles are small and never reach the length of even a domestic cockroach. In part, such small sizes help them remain invisible to people for a long time, and due to this it is safe to grow and even turn into beetles and leave their own offspring even in completely clean and well-kept apartments.

List of larvae with independent names

• The axolotl is a neotenic larva of Ambystoma (tailed amphibians).
• Actinotroch is a phoronid larva.
• Auricularia is the early phase of development of holothurian larvae.
• Bipinnaria is the early phase of sea star larval development.
• Brachiolaria is the late developmental stage of a starfish larva.
• Veliger is a larva of gastropods and bivalves.
• Glaucotoe is a crawling crustacean larva.
• Glochidium is a larva of bivalves.
• A tadpole is the larva of a tailless amphibian.
• The caterpillar is the larva of butterflies.
• Dipleurula (dipleurula) is an early larval form common to echinoderms and coelenterates, which later transforms in different groups into auricularia, bipinnaria, pluteus or tornaria.
• Doliolaria is the middle phase of development of holothurian larvae.
• Zoea is an early larva of a decapod crustacean.
• Coracidium is a larva of a wide tapeworm, covered with cilia and equipped with six hooks.
• The coretra is a mosquito larva from the family Chaoboridae.
• The rat is the larva of some hover flies (Diptera: Syrphidae).
• Leptocephalus is a larva (fry) of an eel and other eel-like fish.
• Lycophora is a cestode larva.
• The false caterpillar is the larva of sawflies (Hymenoptera-Symphyta).
• The false wireworm is a larva of beetles of the darkling beetle and pollen beetle families.
• Megalopa is a late larva of decapod crustaceans.
• Metanauplius is the larval stage of many crustacean species, following the nauplius.
• Metatrochophore is a larva of polychaete annelids that develops from a trochophore and turns into a nectochaete.
• Mysis is a late larva of long-tailed decapod crustaceans (Decapoda-Macrura).
• Miracidium is a sporocyst larva of flukes (Trematoda).
• The bloodworm is the larva of bell mosquitoes (Diptera: Chironomidae).
• Müllerian larva is the larva of ciliated polyclada worms (Polyclada)
• Nauplius is the early phase of larval development, characteristic of many crustaceans.
• Naiad is the larva of dragonflies.
• Nektochaete is a late larva of polychaete annelids that develops from a metatrochophore.
• Nymph is the traditional name for the larval stage of development of some arthropods with incomplete metamorphosis (mites and a number of groups of insects).
• Oncomiracidium is the larva of monogenea (monogenetic flukes).
• Oncosphere, or six-hooked larva, is the larva of tapeworms (Cestoda).
• Maggot is the larva of round stitch flies.
• Parenchymula is the larva of sponges.
• The pentacle is the late developmental phase of holothurian larvae.
• Sandwort is a lamprey larva.
• Pilidium is a nemertean larva.
• Planktosphere is the larva of a gastrointestinal worm.
• Planula is a coelenterate larva.
• Pluteus, or pluteus, is the larva of an echinoderm. For the larvae of brittle stars and sea urchins, special terms are used: Ophiopluteus, or ophiopluteus - brittle star larva,
• Echinopluteus, or Echinopluteus, is the larva of sea urchins.

Characteristic behavioral feature

In addition to the abundance of hairs on the body, the larvae of skin beetles differ from insects with a similar body shape by their very high mobility. In those moments when they catch your eye in the apartment, they are practically not in place for a second - each larva with an unexpected body shape and “pubescence” crawls, turns, bends and unbends, crawls over various obstacles with remarkable agility, and sensing danger, it accelerates even more. This agility contrasts greatly with her body shape, especially for humans who are accustomed to various worm-like creatures moving slowly and sluggishly.

It should be noted that skin beetle larvae are not always so mobile. Where they are safe and close to food, they are quite economical in expenditure of energy, and simply eat, rest, and sometimes make primitive cocoons of their web. They crawl quickly and are especially active where they are in an unsafe place, mainly when moving in search of food along routes that are new to them.

For example, here is a video of a house beetle larva crawling in an open place on fabric:

Actually, it is in such movements that skin beetle larvae are most often noticed. While they do not crawl far, they are not particularly visible - they spend most of their lives in secluded crevices, cavities, hidden from the eyes of people, forgotten boxes and bags of food, in cabinets that have not been opened for a long time, inside furniture. Here, if they are noticed, it is during rare or random repairs, inspections and cleaning. Most often, their hiding places are so inaccessible that it is difficult to find them in an apartment even with targeted searches, when it is well known that they live somewhere here.

This, by the way, is one of the reasons why it is not always possible to get rid of them. And you definitely need to get rid of them...

Who else is taking over our bodies?

There is a tropical parasite, the sand flea (Tunga penetrans). Females burrow into the sole of the foot to get their fill of human blood. When they get on the skin, they are no larger than a grain of sand, but within a week these guys grow a lot, causing a severe skin disease, sarcopsillosis, or tungiasis. The eggs of a well-fed sand flea fall to the ground and hatch, awaiting the next barefoot. However, science also knows other oviparous parasites that can penetrate not only deep into the skin.

Read even more fascinating articles about the amazing organisms that inhabit our planet on our Yandex.Zen channel. There are regularly published articles that are not on the site!

This is what the parasite that causes severe foot disease looks like

Tapeworms, for example, penetrate the intestines. Adults can be longer than a bowling alley, blocking the digestive system. As the worms develop, the host's health deteriorates as the parasites lay tens of thousands of eggs, which can hatch and migrate, spreading throughout the lungs, muscles and even the brain.

It sounds terrible, but you haven't heard of the Loa Loa "eye worm." The parasite larvae can be transmitted from person to person through fly bites. Five months after entry, the larvae reach maturity and release thousands of embryos per day. Free embryos, in turn, go on a fascinating journey throughout the human body. In fact, the situation can be so severe that worms can be seen moving under the skin or in the eyeball.

Eyeworm Loa Loa is a parasite that you wouldn't wish on your enemy.

How dangerous are these insects?

The main danger of skin beetle larvae is their gluttony and indiscriminate eating. If in wild (or semi-wild) nature they feed mainly on the remains of dead animals - wool, dried and hardened meat, skins, skin, chitinous coverings of dead insects, feathers, sometimes even dry grass - then in apartments they look for substitutes for such food, and easily damaged:

• Fur
• Wool knitwear
• Leather shoes and clothes
• Carpets made of natural wool or cotton
• Various collections – herbariums, insect collections
• Skins
• Stuffed animals and birds
• Various animal products - cheeses, sausages, dried fish and meat, meat and bone meal, dog and cat food
• Cereals and groceries (by the way, they are not eaten by the larvae of all types of skin beetles)

This is, for example, what a fur coat looks like after encountering skin beetle larvae:

And it is clear that if, say, no one is particularly upset because of a kilogram of damaged cereal, then a chewed expensive fur coat, or good shoes with ugly furrows, is serious damage.

On a note

Skin beetle larvae can eat any tissue of the animal body, except bones. This is used in some museums: the remains of animals whose bones they want to preserve for collections are specially placed in a room where thousands of beetles and their larvae are located, and in a few days these voluntary cleaners “remove” absolutely everything from the bones, including ligaments, tendons and places muscle attachments. After their work, the bone will not rot or stink - there is simply nothing left that could rot.

Moreover, due to their small size, immediately after hatching from eggs, the larvae of skin beetles can get through the smallest cracks into boxes, for example, with collections of insects . Of course, doors to closets with fur coats and sweaters will definitely not stop them.

It is interesting that larvae can begin their destructive activity in an apartment, for example, in a sofa drawer, or behind a baseboard, where they will simply eat microscopic exfoliating pieces of skin, hair and the remains of cockroaches. And when they grow up and their appetites increase, they will already go in search of more abundant sources of food. And at this stage the larva is already dangerous for things: it can gnaw through a sweater, “shave” a stain on a fur coat, or make holes in the carpet. And when there are many such larvae, this danger increases many times over.

For example, in the photo there is litter damaged by larvae:

And here are slippers, forgotten under the sofa and found by hungry leather-fed children:

In fact, this can happen to any natural fabric - leather beetles will happily eat silk, cotton, and wool. And if they get on a leather sofa, they will gnaw the leather too.

Do skin beetle larvae bite humans?

There are many stories and reports of people being bitten by skin beetle larvae in their beds. Sometimes people find these pests directly on themselves, sometimes they wake up with bites on their bodies, inspect their sleeping place, find skin beetle larvae and think that these are the offenders.

It is impossible to say unequivocally whether skin beetle larvae bite a person or not. Theoretically, they can bite, but in fact they have no need for such attacks: both on the bed itself and near it there is always enough food for them. But it cannot be denied that, having stumbled upon the heel of a sleeping person in its travels, such a larva may well try to gnaw the skin on it.

On the other hand, the possibility of human error cannot be denied. Very often, people wake up, find a bite, or several bites, on themselves, begin to inspect the bed, find skin beetles peacefully gnawing hair and skin from their heels, and blame the bites on them. And somewhere in the cracks of the bed frames, bedbugs remain secluded and unnoticed, and the next night they will crawl out again and bite a person.

Wool blanket heavily infested with carpet beetles

We often encounter similar situations in our practice: a person calls us and asks us to come and poison the skin beetles. They, they say, bite him, he found them, poisoned and destroyed them all, and the bites appear again. We arrive, find bedbugs in his apartment, and remove them.

Often, by the way, people blame the skin beetle larvae in this way because they are afraid to admit that bedbugs live in their home. At least in our practice, more than half of people’s reports of skin beetle bites turned out to be mistakes, and the bites turned out to be bedbug bites.

On a note

Also, very often people report that they are bitten by carpet beetles. This is almost certainly a mistake: these bugs for the most part do not feed on anything at all, and therefore they will not even try to chew on a person.

At the same time, in many apartments and houses where we removed skin beetles, people complained that these insects were biting them, but we did not find anyone - no bedbugs, no fleas, no mosquitoes. That is, it is impossible to confidently deny the possibility of being bitten by skin beetles.

Dream Interpretation, Larva

If you have seen insect larvae, it means that soon you will learn something about an important person that will greatly surprise you, and you will want to tell others about the news. No need to do this

You should think again and again: do you really want this? Won't you ruin the life of both yourself and the person who has become the object of your random attention? . Larva!! If you saw insect larvae in a dream, it means that soon you will learn something about an important person that will greatly surprise you; you will want to tell others about the news. There is no need to do this. You should think again and again: do you really want this? Won't you ruin the life of both yourself and the person who became the object of your random attention?!! Mercenary!! If you dreamed that you were a mercenary, it means that in real life you will have to help a person who is not very attractive to you.

Where to look for them?

In general, skin beetle larvae are very secretive insects. Unless absolutely necessary, they do not get out of their hiding places, do not crawl into open places and do not get noticed. The bulk of them spend almost their entire larval age in places where people not only don’t look, but where they can’t even get to.

For example, during processing we most often found skin beetle larvae in the following places:

• Gaps behind baseboards near kitchen tables
• Floors under the edges of linoleum under stoves, refrigerators and tables - food crumbs often roll in here
• Cabinets with things, especially wool and fur
• Closets and cabinets with forgotten food supplies
• Natural fabric bedding
• Sleeping places – beds and sofas

Litter on the floor with traces of feeding by carpet beetle larvae
It is very important to understand that the larvae that you notice somewhere in the open, actively crawling, are only individual individuals. The bulk of their counterparts are located somewhere where it is very difficult to look, and where they can only be found by moving furniture, dismantling the bed, or removing the baseboard. Therefore, you should not expect that by crushing several of these pests, you will get rid of all the skin beetles in the house.

On a note

But adult beetles can be found almost anywhere in the apartment. They actively fly and crawl in search of sexual partners and places for laying eggs, and on such wanderings they very often catch the eye. At each such meeting, the bugs must be destroyed so that at least these individuals do not reproduce in any way.

How and with what can skin beetles be removed?

Skin beetle larvae are destroyed by almost any insecticide, including those intended for household use. This allows you to fight them almost everywhere, wherever they are: drugs can be injected into the cracks behind the baseboards, they can be spilled on thick bedding and carpets, in the depths of which the smallest larvae can huddle between the fibers, they can be used to treat any furniture elements.

As a rule, after thoroughly treating with a good insecticidal agent all the places where the larvae can hide, not a single one of them remains alive.

For such destruction, products based on insecticides of different groups are suitable:

• Pyrethroids – most of the drugs in the Raid, Raptor, Combat lines, as well as Delta-Zone, Lambda-Zone, Medilis-Ziper, Get Express, and others.
• Organophosphorus compounds - Executioner, Karbofos, Medilis-Malathion, Get Total, and others.
• Silicon dioxide in various forms (including kieselguhr) - Hector, Ecokiller, Eco-Dust.

The more places in the room are sprayed with a solution of one, or even better, several of these products, the greater the likelihood that all skin beetles here will be destroyed.

Ideally, you should spray your apartment not with a hand sprayer, but with a cold fog generator, the solution from which itself is drawn into the narrowest crevices with air. But only professional disinfectors have such generators, and it is possible to treat a room in this way only by calling a special service.

Treatment of an apartment using a cold fog generator

According to our statistics, after proper treatment of the premises, skin beetles die here completely in 100% of cases. At least, in our practice, there were no situations when, after disinfestation of skin beetles, we had to do a second treatment in order to finish off the surviving individuals. In all treatments, all larvae and beetles die the first time.

By the way, skin beetle larvae have a weak point, which to some extent makes the task of destroying them easier.

The weak point of all skin beetles

The “Achilles heel” of skin beetle larvae is their rather long development time.

For example, in carpet beetle larvae develop in 6 months under ideal conditions, up to 3 years in non-ideal conditions, and on average one and a half to two years. The larvae of the house leather beetle develop for a year and a half, while for the museum leather beetle it takes 10-11 months.

From left to right: an adult beetle, a discarded chitinous shell of a larva, a pupa and a last instar larva.

For comparison: bed bug nymphs go from hatching from an egg to sexual maturity in 4-5 weeks, and barn moth larvae (also called kitchen moths) in 1-2 months.

Because of such slow development, skin beetles do not have time to reproduce quickly enough anywhere, and therefore they are relatively easy to destroy. It is enough to kill the larvae and beetles in the places of the main accumulations, and then only finish off the individuals that accidentally catch your eye when you meet them in order to completely exterminate them indoors. They will not be able to quickly multiply, as happens with cockroaches, and restore their numbers.

But despite this, many people fail to completely get rid of skin beetles. The reasons for this are typical, but not always removable.