We explain what invertebrate animals are and how these animals are classified. In addition, examples of invertebrates.
It is known as invertebrate animals to all the species of the animal kingdom that do not have a notocordio or dorsal cord, nor a spine, nor an articulated internal skeleton. In this set, 95% of the known living species are found, between 1.7 and 1.8 million species (2005 figures).
Invertebrates are also usually smaller, compared to large terrestrial or aquatic vertebrates , and although they lack an articulated skeleton , they often have exoskeletons (such as insects) or shells and shells of resistant substances (such as mollusks) .
This is not a homogeneous group, much less: since the beginning of the term “invertebrate” (from the French animaux sans vertèbres , animals without vertebrae), its creator, the naturalist Jean-Baptiste Lamarck , subdivided them into ten different classes : mollusks, Cirripeda, annelids, crabs, spiders, insects, worms, echinoderms, polyps and infusoria. This classification is no longer used, of course.
The invertebrate group has been difficult to classify and study, given its small size and the diversity of environments they inhabit . In the current classification of zoology , it is estimated that the group is composed of animals of the following edges:
Some common examples of invertebrate fauna can be the following:
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