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Arachnids
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An arachnid is any member of the class Arachnida, part of the
invertebrate phylum Arthropoda. Arachnida are best known for the
Araneida (spiders) and the Scorpionida (scorpions), but also includes
the Opiliones (daddy longlegs) and Acari (mites and ticks). The
arachnids have a segmented body, a tough exoskeleton, and jointed
appendages. Most are carnivorous. Arachnids lack jaws and, with only a
few exceptions, inject digestive fluids into their prey before sucking
the liquefied remains into their mouths. Except among the acarids in
which the entire body forms a single region, the arachnid body is
divided into two distinct parts: the cephalothorax,
or prosoma, and the abdomen, or opisthosoma. |
Spider Poster |
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