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Anatomy of a Wolf Spider

All spiders have in common a two-segmented body, eight legs, spinnerets and the absence of chewing mouthparts or wings. The eight noncompound eyes of the wolf spider are arranged with one lower row of four small eyes, two larger eyes and two more small eyes on top of the head.

Chelicerae, or jaws, are used to hold prey, inject venom and eat. Two sharp, horizontal fangs are present at the extreme bottom of these jaws. Also present near the jaw are the palps, which serve as sensory structures and as sperm storage in the male wolf spider.

The circulatory system of the wolf spider is open, meaning the blood isn’t confined and delivered inside of a closed system, and contains hemolymph, a respiratory protein similar in function to hemoglobin. Hemolymph is pumped through the heart and bathes the internal organs and tissues.

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