Arthropods have hard exoskeletons, segmented bodies, and jointed appendages used for moving and feeding. Arthropods constitute over 90% of the animal kingdom. They are distinguished from other animals by an exoskeleton (a skeleton on the outside of the body), body divided into distinct parts, jointed legs and appendages, and bilateral symmetry (both sides of the body are the same).
The Class Arthropoda is further organized into finer groupings including:
- Order (1): Arthropoda
- Species: ZipcodeZoo has pages for 79 species and subspecies in the Class Arthropoda.
An arthropod is an invertebrate animal having an exoskeleton (external skeleton), a segmented body, and jointed appendages. Arthropods are members of the phylum Arthropoda (from Greek ?rthron, "joint", and p?d?? pod?s "foot", which together mean "jointed feet"), and include the insects, arachnids, crustaceans, and others. Arthropods are characterized by their jointed limbs and cuticles, which are mainly made of a-chitin; the cuticles of crustaceans are also biomineralized with calcium carbonate. The rigid cuticle inhibits growth, so arthropods replace it periodically by molting. The arthropod body plan consists of repeated segments, each with a pair of appendages. It is so versatile that they have been compared to Swiss Army knives, and it has enabled them to become the most species-rich members of all ecological guilds in most environments. They have over a million described species, making up more than 80% of all described living animal species, and are one of only two animal groups that are very successful in dry environments ? the other being the amniotes. They range in size from microscopic plankton up to forms a few meters long. [more]
At least 80 species and subspecies belong to the Order Arthropoda.
More info about the Order Arthropoda may be found here.
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