Insects are, without a doubt, one of the groups of invertebrates most diverse and surprising of nature. Its biodiversity is incalculable, since there are still many species to discover and study, especially in the ecosystems of tropical forests in humid regions, where insects coexist and multiply. It is estimated that the number of species of insects discovered to date outnumbers the number of human beings that inhabit the Earth, that is, there are more than 8,000 million species of insects.
As we can imagine, the classification of all of them, as well as the study of their anatomical characteristics and their main functions within the ecosystems in which they inhabit, is really complex and fascinating. Entomology is the science that takes care of this, but you don't have to be expert entomologists to have some basic notions about the insects that surround us, we can always learn about them by reading an article on the subject, like this one that we published from Green Ecologist, on classification of insects.
The taxonomy or classification of insects It allows us to better understand the different groups and classes of insects that exist according to their main characteristics. The classification of this type of invertebrate animals is very broad, but in this article we will know the most common groups:
The external anatomy of insects It is one of the most complex and fascinating in the animal kingdom. Its structure is characterized by:
Made up of a resistant cuticle, the exoskeleton covers and protects the intestines, tracheas and other vulnerable organs against blows and damage. This exoskeleton of great importance for the development and survival of insects, adapts to the segmented anatomy of these organisms, which presents three well differentiated body regions: head, thorax and abdomen.
The outside of the head of insects is called the cephalic capsule. In it, both the eyes and the jaws appear, as well as different appendages as antennae and others as mouthparts (maxillae and lip).
The thorax is in turn divided into 3 well-differentiated thoracic segments, in which are the legs and wings of insects. They vary in number, morphology, and function.
Finally, the abdomen completes the complex external anatomy of insects. It is made up of a variable number of segments depending on the species (between 7 or 11 segments), among which the genital segments stand out (eighth and ninth segment in females; ninth in males).
Refering to feeding insects, It is worth noting the great variety of diets and habits that they present. There are leaf-eating insects of terrestrial or aquatic plants, predators of other insects, parasitoids, ectoparasites, bloodsucking of mammals and birds; as well as those that feed on the nectar and / or pollen of the flowers of flowering plants (angiosperms), thus contributing to the wonderful process of plant pollination. Here you can find out which are the pollinating insects.
However, another of the amazing processes that characterize insects is, without a doubt, metamorphosis. Through it, insects change their appearance and structure in various stages, from hatch to adulthood. To do this, individuals undergo the shedding of the outermost part of their "skin" (cuticle), thus allowing the growth of insect tissues that had not matured. In addition, several organs characteristic exclusively of adults (such as the reproductive system) are differentiated.
In this way, the adult individuals will be reproductively active and will be prepared to carry out copulation between adult individuals of the opposite sex, this being the most common reproductive method. Later, the females deposit the eggs and after a more or less long incubation period, an immature insect will be born from each egg. However, there are other processes of reproduction of insects, such as parthenogenesis (the eggs develop completely without being fertilized), polyembryony (two or more embryos are produced from a single egg), and viviparity (when embryonic development is completed inside the body of the mother, which produces young larvae instead of laying eggs).
The wingless insects are grouped within the Aterans, which includes species such as:
If you want to read more articles similar to Classification of insects, we recommend that you enter our Wild Animals category.
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