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Spiders

Any arachnid of the order Araneae, having a body divided into a cephalothorax with eight legs, two poison fangs, and two feelers as well as an unsegmented abdomen with several spinnerets that produce the silk used to make nests, cocoons, or webs for trapping insects.

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Spiders

Patella

Animals; Spiders

The fourth segment of the leg or palp, counting from the body.

Pedicel

Animals; Spiders

The narrow stalk connecting the cephalothorax and the abdomen.

Pheromone

Animals; Spiders

A chemical secreted by an animal in minute amounts which brings about a behavioural response in another, often of the opposite sex.

Spinners

Animals; Spiders

Paired appendages at the rear end of the abdomen, below the anal tubercle, from the spigots of which silk strands are extruded.

Spiracle

Animals; Spiders

The opening of the tracheae on the underside of the abdomen.

Stadium

Animals; Spiders

The interval between the moults of arthropods; instar; a period in the development of an arthropod.

Sternum

Animals; Spiders

The heart-shaped or oval exoskeletal shield covering the under surface of the cephalothorax.

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