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Arthropods - Quick Checklist
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"Ctrl"+"F" (it may be different from the various browsers) OPILIONES (Daddy-Longlegs) - Four pairs of long, slender legs (the second pair is the longest) - Body in one piece - Abdomen with distinct segments SCORPIONES (Scorpions) - Conspicuous "pincers" (pedipalps) ahead of shorter legs - Abdomen with distinct segments, abdomen ends in a stinger - Fairly large body - Four pairs of legs PSEUDOSCORPIONES (Pseudoscorpions) - Conspicuous "pincers" (pedipalps) ahead of shorter legs - Abdomen with distinct segments, the abdomen does not end in a stinger - Small body usually smaller than 3mm - Four pairs of legs ARANAE (Spiders) - Body clearly divided into two main parts (cephalothorax and abdomen) - Abdomen without segments - Four pairs of legs ACARI (Mites & Ticks) - Body usually tiny, oval-shaped (not divided into two main parts) - Abdomen without segments - Four pairs of legs (immatures with three pairs of legs) ISOPODA (Pillbugs, sowbugs) - Body composed of hard, flattened plates - Seven pairs of tiny legs, barely visible from above - Some roll up into balls SYMPHYLA - Slender and whitish body, often about 1 mm long - 10-12 pairs of short legs CHILOPODA (Centipedes) - Flattened body - More than 15 pairs of legs, visible from above - One pair of legs attached to each body segment DIPLOPODA (Millipedes) - Usually tube-like body (sometimes flattened) - More than 30 pairs of legs - Two pairs of legs attached to each body segment Found on www.amnh.com |