Features of arachnids.

Arachnids are a large group of terrestrial arthropods.
They have the following features:
* they are eight-legged
* the brain has a more complex structure, the abdominal nerve chain is formed by large nerve nodes
* the nervous system in representatives of this class is diverse, but a common feature is the high development of the supraopharyngeal ganglion
* lack of antennae and compound eyes
* excretory organs – malpightive vessels
* eyes are simple and their number may be different in different species of arachnids

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