Recently, my home was suddenly filled with a black bug, which made me sick. Want to ask what bug it is? (Yes)

Ma Lu, also known as millipede. Ma Lu belongs to Polydactyla, a subclass of Arthropoda. It happened all over the country. In addition to the lawn, there are also flower plants such as Cyclamen, Cucurbita, Orchid, Adiantum, Begonia, Begonia and Asparagus.

Arthropod phylum

Worldwide distribution, biped and several other classes of animals are usually collectively referred to as Polypoda. There are about 65,438+00,000 species in Ma Lu, which feed on decaying plants, some are harmful to plants, and a few are carnivores or scavengers. Characterized by the combination of two body parts (double body parts). Except that the head segment has no feet, each of the three body segments behind the head segment has one foot, and the other body segments have two pairs of feet, and the total number of feet can be as many as 200 pairs.

In addition to the first four segments, each pair of twin segments also contains two pairs of internal organs: two pairs of ganglia and two pairs of cardiac arteries. The cephalic segment contains antennae, a single eye and a pair of palates. The number of body segments ranges from 1 1 to more than 100, with a body length of 2? 280 mm (0.08？ 1 1 inch). All Ma Lu have lime backboards except for one purpose.

In self-defense, Ma Lu didn't bite, but curled up with his head inside and his exoskeleton outside. Many species may have lateral glands, which secrete irritating venom or poisonous gas to prevent enemies from hurting them.

Biped animals include many common species in gardens, such as Ma Lu, which is 25mm (1 inch) long, originated in Europe and has been introduced to North America. Species with smooth bodies are often called nematodes.

Some Ma Lu have no eyes and bright colors, such as Ma Lu in 25 mm greenhouse. One of the most striking common species is the American daffodil, which is 10 cm (4 inches) long and has black and red colors.

Biological characteristics: Ma Lu likes yin and dampness. Generally, they live on the lawn soil surface, under clods and squares, or in soil crevices, lurking during the day and moving at night. When Ma Lu is touched, he will curl up in a circle, showing a "suspended animation" shape, and will resume his activities after a period of time.

Ma Lu generally harms young roots, tender seedlings and tender stems and leaves of plants. Ma Lu's eggs are laid on the lawn soil, and the eggs are laid in piles. There is a transparent sticky substance outside the egg, and each egg can produce about 300 eggs. At a suitable temperature, eggs hatch into larvae in about 20 days and mature in a few months. Red deer 1 year breeding 1 time, the life span can reach 1 year or more.

Extended data

Ecological function

1, Ma Lu is an important decomposer of forest ecosystem, and Ma Lu's food intake increases with the increase of temperature. According to preliminary estimation, the decomposed litter in Ma Lu accounts for about 265,438+0% of the annual average litter in this area, while the leaf intake of the same species with different decomposition degrees in Ma Lu is different, and the intake of semi-decomposed litter is greater than that of undecomposed litter.

2. Under different temperature conditions, the feeding efficiency of Ma Lu is different, its assimilation efficiency decreases with the increase of temperature, and the fecal excretion increases with the increase of temperature, and the individual number distribution is uneven under different forest types. The vertical distribution of general broad-leaved forest, mixed coniferous forest and coniferous forest in soil has obvious surface aggregation phenomenon. The number of individuals in Ma Lu has obvious seasonal changes, with the most in late summer and the least in late winter.

3. Soil animals are important decomposers in the material cycle of ecosystems. Ma Lu is a common group of soil animals, which mainly feed on plant residues such as litter and decaying wood, and it is one of the first processors of material decomposition in the ecosystem.

4. The research on the feeding of large soil animals has been reported at home and abroad, but the research on Ma Lu has not been reported in China; By studying the ecological distribution and food intake of red deer, the role of this group in the process of material decomposition in forest ecosystem was discussed and revealed.

Millipedes are not born with so many feet. Larvae was born with only 7 nodes, and molting increased to 1 1 node at a time, with 7 pairs of feet; After the second molting, it increased to 15 joints and feet 15 pairs; After several metamorphosis and development, the number of body segments gradually increased and the number of feet also increased.

6. Of course, there are many other kinds of millipedes. Some bodies are smaller, only 2 mm long; Compared with Ma Lu, they have much fewer feet.

Related common sense

1, toxicity

Although there is no poisonous jaw, Ma Lu has smelly glands on his body joints, which can secrete a poisonous smelly liquid, making poultry and birds afraid to peck it. Eating Ma Lu by mistake will lead to allergic edema of lips and so on.

2. Earth's

There is a big road in Panama Valley in North America, with 175 joints, which add up to 690 feet. It can be said to be the largest arthropod in the world.

3. Epidemic prevention

Ma Lu likes humidity, which is easy to bring bacteria. When quicklime is scattered in its haunts, its humid environment will become dry, and red deer will not breed. You can also use "triazophos" spray, but people with skin allergies had better not use it.

4, sting treatment

Millipedes don't bite, but when they touch and play with it, they will secrete toxins that can cause local irritation, and in severe cases, they can cause obvious erythema, herpes and necrosis. The toxic secretion of millipedes in the skin should be washed with plenty of soap and water, but alcohol must not be used. If the skin reacts, corticosteroids can be used externally. Eye injuries should be washed immediately and corticosteroid eye drops or ointment should be used.

5. Ma Lu and centipede

Some citizens will mistake Ma Lu for centipede, but it is actually two branches of arthropods. Ma Lu's body is long and round, and it is composed of black and yellow segments. The head has a pair of tentacles, and each segment has two pairs of slender black feet.

Reference: Baidu Encyclopedia-Ma Lu