The head of an insect
The head of an insect has antennae , compound eyes , monocular eyes , and mouthparts. Thus, the head is the center of the insect's sensation and feeding.
First, the head of the insect
The head of an insect can be divided into three types of heads according to the position of the mouthparts:
1. Lower mouth type: the mouthpiece is downward, such as locusts.
2. Front mouth type: the mouthpiece is forward, such as step nails.
3. Rear mouth type: The mouthpiece is tilted backwards, like a cicada.
Second, the antennae of insects
The antennae of insects are sensory organs, mainly olfactory organs, commonly used to find food and mates, but also touch and hearing. Antennae are freely movable, segmented appendages that live on the antennal fossa at the anterior end of the compound anterior eye.
1. The structure of the antennae
The antennae are divided into three sections: (1) the stem section: the first section, thick and short; (2) the stem section: the second section, small. (3) Whip sections: the rest of the sections. There are many types of antennae, mainly caused by changes in whiplash.
2. Type of antennae
Third, the eyes of insects
Insects have compound eyes and monocular eyes, and a few have no compound eyes and monocular eyes.
1. Compound eye: The compound eye of insects is possessed by adult worms and nymphs. The compound eye is made up of many monocular eyes.
The compound eye is the main visual organ of insects, which can see the image of objects and plays an important role in feeding, clustering, reproduction and determining the direction of movement.
2, monocular: adult insects have 0-3 monocular. The larvae generally have 4-6 lateral monocular eyes.
The single eye only distinguishes the intensity of light and the distance.
Fourth, the mouthparts of insects
1. Chewable mouthpiece
Harmful conditions: lack of carving, holes, borers, latent leaves, tumors, etc. Such as locusts, beetles, moths and butterflies larvae, etc., are all chewing mouthparts.
2. Absorbent mouthpiece
1) Suction mouthpiece
Harmful: spots, curly leaves, green legs, dead, deformity, etc. Hemiptera such as cicadas, aphids, and bugs and homoptera insects are all such mouth organs.
2) Siphon mouthpiece
It is a non-hazardous mouthpiece. It is a mouth organ peculiar to adult lepidoptera (moth butterfly).
3) Frustrated suction mouthpiece
Harmful traits include discoloration, spots, deformities, creases, curls, etc. It is a mouth organ peculiar to the thrips of the order Taemona.
4) Licking suction mouthpiece
It is a non-hazardous mouthpiece. It is a type of mouthpart that is unique to higher flies.
See here
Finally got it
The students are all high-achieving students
It's not easy to remember
The thorax of an insect
The thorax of insects is anterior, middle and hindhorax. Below each thoracic segment is a pair of pectoral feet, called forefoot, midfoot and hindzu respectively. On the dorsal side of the middle and hindskoma have a pair of wings, called forewings and hindwings, respectively, so the thorax is the center of movement of insects.
First, the general structure of the chest
Second, the appendage of the chest
1. The feet of insects
2. Insect wings
The abdomen of the insect
There are organ systems such as digestion, excretion, breathing and reproduction in the abdomen. Therefore, the abdomen is the center of insect metabolism and reproduction.
The abdomen of insects has a total of 11 segments, but most insects have fewer than 10 segments after they usually heal. The abdomen has valves at 1-8 segments, and the appendages at the end of the abdomen are specialized into external genitalia and tail whiskers.
The body wall of an insect
The body wall is the surface shell of the insect, also known as the exoskeleton, which accounts for about 1/2 of the dry weight of the body. The main functions are: to keep the body intact; to provide for the internal muscles to live; to protect the internal organs from mechanical damage; to prevent the evaporation of water in the body; to prevent the invasion of poisons.
The insects in nature are colorful, some are gorgeous and beautiful, some are dazzling, and some even change color. Why the color of insects is so rich, this is related to the pigment of their body surface, the color of the insect body surface is mainly determined by the following three pigments:
1. Pigment color: There is pigment in the wall of the insect body, which can absorb or reflect certain light waves and form a color. Such as the black of the elytra and so on. When the chemical properties of the pigment change (such as boiling, bleaching), its color changes or disappears.
2. Structural color: The color produced by the refraction, reflection and interference of light waves on the special structure of the surface of the insect body will not fade. Such as the metallic luster of the golden edge of the chitin.
3. Mixed color: a color that is synthesized by a pigment color and a structural color. For example, the bright green color of the butterfly is a mixture of blue structure color and yellow pigment color.
Source: China Guomen Times