What are the characteristics of the head of a snail, the appearance characteristics of a snail

Head: The snail has 2 pairs of antennae on its head, of which the long antennae have eyes at the end, and the mouth is located on the ventral surface of the head, with a toothed tongue inside, which can be used to scrape food.

Shell: The shape and color of the shell are related to the snail species, among which the shell shape is mainly spherical, conical, pagoda-shaped, gyro-shaped, pipe-shaped, etc., and the colors are mainly yellow, black, white, red, brown, green, gray, etc.

Gastropod: Formed by the abdominal wall, the gastropod secretes mucus that helps crawl.

First, the head

1. Antennae: The snail has a total of 2 pairs of antennae, both of which are located on the head, of which the upper pair of antennae is longer and the lower pair of antennae is shorter. The antennae can play the role of feeling the external environment, and at the same time, they can play the role of the nose and smell smells.

2. Eyes: The eyes of snails are located at the ends of the long antennae and have vision. It is understood that in a weak light environment, snails can observe objects 6cm away, while under strong light irradiation, snails can only observe objects 4-5mm away.

3. Mouth: The mouth of the snail is located on the ventral surface of the head, with a toothed tongue, and tens of thousands of teeth are distributed on the tooth tongue, which is the animal with the largest number of teeth in the world (snails cannot chew food, can only scrape food with teeth and tongue, and then crush food with teeth). As the teeth are eaten, they gradually wear out and become passivated and replaced by new teeth.

Second, the shell

The snail has a spiral-shaped shell on its back, right-handed or left-handed. The shell shape can be divided into pagoda-shaped, gyro-shaped, conical, spherical, pipe-shaped, and the color is also varied, mainly yellow, orange, red, brown, green, gray, black and white.

3. Gastropod

The snail's developed wide fleshy feet are formed by the abdominal wall, and during the snail's crawling, the foot glands of the gastropod can secrete mucus (septum effect) to avoid injury caused by direct friction between the gastropod muscles and the ground, and the wetness of the mucus is also conducive to snail crawling.

Snails belong to the mollusks, gastropods. 1. Snails have carapaces, shaped like small snails, and have diverse colors; The head has four antennae, the head is extended when walking, and the head and tail are retracted into the carapace together when frightened; 2. The whole body of the snail includes eyes, mouth, feet, shells, antennae and other parts, and the spiral shells on the back of the body are different in shape, color and size, and their shells are pagoda-shaped, top-shaped, conical, spherical, pipe-shaped, etc.

Characteristics: 1. Snails have amazing survival ability and have a strong tolerance to cold, heat, hunger, and drought. Prefer constant temperature breeding. The temperature is constant between 25 and 28, and the growth and reproduction are vigorous.

When a snail crawls, it also leaves a trail of mucus on the ground, which is a fluid secreted in its body, even if it is on a knife edge, it is not dangerous.

2. Snails mainly feed on plant stems and leaves, flowers and fruits, as well as roots. It is one of the agricultural pests and an intermediate host for some parasites of livestock and poultry.

3. Snails like to burrow into loose humus soil to inhabit, lay eggs, regulate the humidity in the body and absorb some nutrients, which can be as long as 12 hours. Omnivorous and partial feeding coexist. Likes humidity and is afraid of flooding.

4. Snails like to live in a dark and damp, loose and humic environment, nocturnal, most afraid of direct sunlight, sensitive to environmental reactions, most suitable for the environment: temperature 16 30 (23 30, the fastest growth and development); Air humidity 60% 90%;

The humidity of the feeding soil is about 40%; The pH is 5 7. When the temperature is below 15 and above 33, it is dormant, and when it is lower than 5 or higher than 40, it may freeze to death or heat death.

1. Slow action: Slow action is one of the characteristics of snails.

2. Stress: Generally, snails will have a strong stress response to substances such as salt.

3. Like to live in dark and damp places: common in vegetable gardens, orchards, shrubs and other places.

4. Like to eat green plants: Generally, the main food of snails is the stems and leaves, flowers and fruits of some green plants.

5. Hard shell on the back: Generally, the snail will have a hard shell, which is not only the house of the snail but also the main way to protect the snail.

6. Invertebrates: Snails are common invertebrates.

Characteristics and habits of snails:

Snails are invertebrates.

Mollusca, gastropod, subclass lung, snailidae. It has a carapace, a variety of shapes and colors, and generally has four antennae on the head, the head will stick out when walking, and the head and tail will be retracted into the carapace together when frightened, and generally prefer to live in dark and damp, loose and humus.

In the environment, they like to be nocturnal, are more afraid of direct sunlight, are sensitive to environmental reactions, and mainly feed on plant stems and leaves, flowers and fruits, and roots.