Crustaceans

The Crustaceans are Arthropods that have five legs. Most of the Crustaceans live on the ocean bottom or near on it. Some Crustaceans live in fresh waters, some live on lands. Belong to this group are the crab, the lobster and the shrimp.

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The Crustaceans have an organ called Antennae. This Antennae are use to touch, taste and smell. Crustaceans usually hunt for their food at night. They use their Antennae to find food even in darkness. They can also regenerate or produce new legs if they lose them.

Arachnids

The Arachnids are Arthropods that have four legs. Most of this kind live on land, few of them live in the fresh waters. Belong to this group are the Spiders, Mites, and Ticks. The Spider is a kind of Arachnid. Most of them catches food ( particularly insects) by trapping it and stings it with poison. the poison from the Spider will turn the inside of the insect into a liquid. The Spider then drinks this liquid.

Insects

The insects are considered as the biggest group of Arthropods. There are about 700,000 different species of insects. Insects has three pairs of legs and an antennae. Most insects have wings which allows them to find food in distance and large areas. This insects have three main body parts; the Head, the Thorax, and the Abdomen. The Thorax is theie middle part.

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Insect usually have two Kinds of eyes; the Simple eyes and the Compound eyes. The Simple eyes can see light and darkness. The Compound Eyes can form sharp images and see movements with thousand of lenses. Insect reproduce very quick and in a large number.

Millipedes and Centipedes

Millipedes means “Thousand of Feet” and Centipede means “Hundred of Feet”. In reality they really have less than one hundred legs. This group of Arthropods have different segments in their bodies. The Millipedes has four legs in every segment while the Centipedes has two legs in every segment.

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The Millipedes eat plants. The Centipedes have their claws with poison glands which help them in catching insects or earthworms.