Arthropods have an external skeletal structure, or "exoskeleton", usually made from a material called "chitin", a natural-made carbohydrate-based polymer. It is strengthened with proteins and calcium carbonate occuring on the outside . Exoskeleton is light weight , tough and composed of structural polysaccharide chitin . The same applies to any appendages (legs, arms, tails, pincers) an arthropod may have; these too are made up of tough but flexible joints that allow them to maneuver easily over most surfaces. Some prominent ones include insects, spiders, ants, bees, crabs, shrimps, millipedes, centipedes etc. Arthropods are a lineage of life that developed skeletons on the outside – their hard shells, made of a material called “chitin” – instead of on the inside for structural support. 4. Phylum Arthropoda. A hard exoskeleton: The exoskeleton of an arthropod is made of a strong polysaccharide called chitin. - A large variety of appendages differs from arthropod to arthropod, enabling different purposes/uses such as feeding, grasp prey, walking, jumping. Therefore there is a large variation of ecological niches taken up by arthropods. B) acts as an anchor for antagonistic muscles. Advanced sensory system - Compound eyes: able … They have come in all shapes and sizes. Arthropods are the most successful group of animals . The easiest way to tell an arthropod from any other animal is to see if they have: 1) A segmented body. Compound eyes: Compound eyes allow arthropods … Arthropods’ bodies also have other important differences from those of vertebrates like ourselves – their organ systems are simpler and less efficient, which limits the size arthropods can attain. Their success is due to unique chitinous cuticle . They have evolved to fill a variety of ecological niches — from tiny internal parasite to giant bird-eating predator. E) forms the basis of the arthropod hydrostatic skeleton. D) has extra thickening at the joints to protect them. Almost any way you look at them, arthropods are successful: They have been around for more than 500 million years and are still evolving. This hard shell protects the animal, retains moisture, and sometimes even plays a role in reproduction. A tough covering that is composed of over-lapping plates (linked together by tough but flexible hinge joints) allows the arthropod to bend, twist, and move about with great freedom. Spiders have two segments and flies have three segments. The exoskeleton of arthropods A) in insects, cannot moult in the presence of juvenile hormone. Scientifically speaking, they all come under the Animal Kingdom under phylum Arthropoda.. This means that they will have a body made up of more than one part. Arthropods are joint-legged animals and you must have come across a few of these animals. They live on Earth in overwhelming numbers. C) is calcified in insects and not in Crustacea. it …