Invertebrates or Avertebrates is a term which has been expressed by the Chevalier de Lamarck to designate animals that have no spine. Invertebrates include all animals if vertebrates (Pisces, reptiles, amphibians, aves, and mammals). Examples of invertebrates are insects, jellyfish, hydra, squid, and worms. Invertebrates including approximately 97% of all parts of the kingdom animalia.
Lamarck split in two groups of invertebrates to the Insecta (insects) and Vermes (worms). But this time, in an increasingly invertebrates are classified into 30 sub-fila starting from simple organisms like sponges and flatworms to more complex organisms like molluscs, echinoderms, and arthropods.
The characteristics of Invertebrate Animals.
Animal species included in the group of invertebrate animals have major features as follows :
- Do not have a spine.
- Usually the nervous system located in the ventral or belly, precisely under the digestive tract.
- Usually Animals Invertebrates have exoskeletons.
- Brain invertebrates are not protected by the skull.
Classification of Animals Invertebrates.
Invertebrates, or commonly called invertebrate divided into nine different classifications, such is
Annelids.
Annelid phylum broad namely consisting of segmented worms, with approximately 15 000 modern species, including earthworms, leeches and leech. These phyla found in several large wet environments, like freshwater and sea. The length of its members begins from below one millimeter to three meters. These phyla are grouped into three classes namely Polychaeta, Oligochaeta and Hirudinea.
Arthropods.
Arthropod phylum that is very large in the animal world as well, including insects, spiders, shrimp, centipedes and other similar animals. Which is another name for animal arthropod jointed. Arthropods generally found in oceans, freshwater, terrestrial, as well as the scope of the air, as well as of a variety of form symbiotic parasites.
Coelenterata.
Phylum Cnidaria is something which consists of approximately 9,000 species of animals simple, just found in the waters, marine environment generally.
Echinoderms.
Echinoderm phylum (derived from the Greek) is something phylum of marine animals including starfish, sea cucumbers, and some relatives.
Molluscs.
Mollusks are animals were soft-bodied selomata triploblastik.
Nemathelminthes.
Nemathelminthes Aschelminthes or it could be called a phylum that was used in the animal kingdom (animalia).
Platyhelminthes.
Platyhelminthes an existing phyla in the Kingdom Animalia (animals).
Sponge.
Sponge is a porous or animal phyla for a very simple multicellular animals.
Protozoa.
With common protozoa can be explained that protozoa which comes from the Greek language, the protos which means first and zoon means animals. Thus, protozoa is the first animal.
Thank you for reading this article. Written and posted by Bambang Sunarno.
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DatePublished: July 25, 2015 at 17:57
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