All the People in the House

Insects, insects (Insecta) - a cluster of arthropods. The largest group of animals. Estimated number of insect species is around 1 million. These are animals of all terrestrial environments, or re-adapted to the aquatic environment. Were the first animals to acquire the ability to active flight. Insect body sizes ranging from 0.25 mm to 350 mm. In Poland, the most numerous orders of insects are represented, butterflies, beetles, hymenopterans and dipterans. Insects are of great importance in nature, among them are both beneficial insects and pests, parasites and commensally. Science that deals with insects is entomology.

Phylogeny

Due to the small amount of fossil evidence (mainly fossils persisted in the muddy sediments), you can not clearly determine how evolution proceeded insects. The oldest known fossil belongs indisputably to the insect, Rhyniognatha hirsti, comes from deposits dated to the early Devonian, about 396 million years, however, would establish insects probably still in the Silurian. Based on the analysis of early fossils, it was found that some insects such as cockroach or Meganeura, did not differ significantly in terms of anatomy of living species today. However, most primitive insects became extinct or evolved considerably.

Phylogeny

Head

 Main article: the head of an insect.

The head consists of two parts:

▪ gland, which, like in higher animals such as vertebrates, covers the brain and leaving him to nerves.

▪ facial, where the mouth organs are located.

Torso [edit]

Chart użyłkowania insect wings

Torso (thorax) is the second (front) section of the body, consisting of three - more or less cast in trench silo with each other - segments. It consists of prothorax, and outer-body inter-body. On each segment there is a pair of legs, and outer-body inter-body and is also present a pair of wings (winged insects).

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* Torso (thorax) is the second (front) section of the body, consisting of three - more or less...