What is the Meaning of: Invertebrates | Concept and Definition of: Invertebrates

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Meanings, definitions, concepts of daily use

Invertebrates are animals that have no spinal column; in other words, they are devoid of vertebrae. However, invertebrate animals are all are those which are not part of the vertebrae of the phylum Chordate subphylum.
The development of the concept of invertebrates is the french naturalist Jean-Baptiste Lamarck (1744-1829), who has seen, over time that there are several classes of this kind of animals and proposed classifications of molluscs, worms, insects, and annelids, among others.
In general, two major groups of invertebrates are recognized: the arthropods and non arthropods. Arthropods are the most diverse branch of the animal Kingdom, with more than a million species (insects, crustaceans, Arachnids).
Invertebrates may have external protection, such as beetles, although some animals have no protection, as it is the case of the Octopus (they are devoid of shell, which is rigid and outdoor coverage that have many species).
Sponges or sponge, for example, are aquatic invertebrate animals in the shape of a bag or a tube with a single opening.
Insects, in turn, are invertebrates deemed to present a pair of antennas, three pairs of legs and two pairs of wings, but these amounts may vary depending on the species.
Crustaceans, such as crabs, lobsters, shrimp and lobsters are invertebrates that live in an aquatic environment, both in fresh water than in sea water and in all depths. It's only arthropods that have two pairs of antennae.
Finally, there is mention the annelid worms, such as earthworms and leeches.
Note: This translation is provided for educational purposes and may contain errors or be inaccurate.