whats the differences between arachnid, insect, athropod? what are ...

The arthropods are are large group of invertebrates that include the subgroups, the Arachnida, (the spiders, ticks and mites), on the Chilopoda, (the centipedes), the Diplopoda (the millipedes) and on the Insecta (the insects). Insects include flies, wasps, bees, beetles, dragonflies, butterflies and moths, amongst others. Insects have three body regions: head, thorax, and abdomen. The head picks up information about the outside world and also houses the mouthparts. Insect use different techniques to eat and they munch their way through all sorts of different foods, so mouthparts vary widely between species. The thorax provides support for the three pairs of legs and, if they have them, for one or two pairs of wings. The abdomen carries out digestion and reproduction. The body of a spider has two parts: a cephalothorax (a fused head and thorax) and an abdomen. The two separate parts are connected by a narrow waist. The upper side of the spider is called the dorsal side and the bottom is called the ventral side. The dorsal side of cephalothorax is made of chitin and is called the carapax. The back the cephalothorax is just called the thorax.

The arachnids, Arachnida, are a class of invertebrate animals in the subphylum Chelicerata. Arachnids are named for the mythological figure Arachne.They are chiefly terrestrial arthropods, some 65,000 to 73,000 species including the spiders, scorpions, harvestmen, ticks, and mites. The arachnids are easily distinguished from the insects by the fact that they have eight legs instead of six. In addition, they also have simple eyes.

An arachnid is defined as being a joint-legged invertebrate. They comprise over 100,000 species of which the spider is perhaps the most well known. Other examples include mites, ticks and the scorpion. Arachnids always have four pairs of legs.

The most common arachnid species is the spider.
An arachnid is any wingless, carnivorous arthropod of the class Arachnida, including spiders, scorpions, mites, ticks, and daddy-longlegs, having a body divided into two parts, the cephalothorax and the abdomen, and having eight appendages (legs) and no antennae.

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Source: http://petitepets.com/blog/bee-disease-pests/whats-the-differences-between-arachnid-insect-athropod-what-are-the-difference-and-similarities/

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