Animal

Learn about animals without a column

animals without a column

Invertebrates lack a spine in their bodies, but some animals have solid structures, called the outer structure

The digestive system in the invertebrates is either deficient or incomplete, minus the channel of digestion with the anus, filled with two openings, a mouth opening and an opening for the anus

The invertebrate movement comes on its own as a muscle contraction, which drives the body to move, or there some elbows that control its movement to move from one place to another

The existing nervous system is capable of sensation and adaptation, and its simplest network of tactile nerves responds, but most have a complex nervous system

The ability to reproduce sexually through fertilization of acolytes with the sperm produced by the animal itself, or through collaborating with the partner, or not sexually through fission and sprouting

Classification of animals without a spine

Invertebrates contain a wide range of species and genotypes, so they grouped hierarchically into six major master groups. These groups include

Arthropods: Scientists estimate that there are 30 million species of arthropods known to be undiscovered species, including insects, mites, spiders, scorpions, crustaceans and others

SKIN SKINS: This group has a skeleton of limestone magnets from the outside, and includes 6000 species: starfish, sea lilies, skin shakes and fragile stars

Hollow objects: This species enjoys the presence of a ventral cavity surrounded by claws, as there are 9,000 species of it, including coral, jellyfish, hydra and sea anemones

Mollusks: These animals have a soft body consisting of foot and mass visceral and cloak, and include the head of the legs and bivalves

Coral reefs: a kind of coral living in New Zealand, they are sensitive animals and live in groups, and they look like alcoves on algae that rock the rocks

Sponge: is divided into glass and experimental sponge, leaving only 10,000 thousand species of it

This type divided into flat and tubular worms, which spread by New Zealand seafarers, and include earthworms, reindeer, and bilateral worms dividing at the head area

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