Chelicerates: Spiders, Scorpions, Horseshoe Crabs, And More

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Chelicerates: Spiders, Scorpions, Horseshoe Crabs, And More

Welcome to the Animals / Wildlife Newsletter, a weekly newsletter published by About.com's Animals / Wildlife website. For more about animals and wildlife, be sure to stop by the growing library of animal profiles.

Laura Klappenbach
Animals & Wildlife Expert
This jumping spider is one of about 77,000 species of chelicerates alive today.
Chelicerates: Spiders, Scorpions, Horseshoe Crabs, And More  
Chelicerates are a group of arthropods that includes harvestmen, scorpions, mites, spiders, horseshoe crabs, sea spiders, and ticks.

 

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Invertebrates are animals that do not have a backbone or a bony skeleton.
Invertebrates: The Spineless Majority  
Find out more about invertebrates, a group that includes more than 97 percent of all animal species alive today.
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This crab is one of 67,000 species of crustaceans, a group of arthropods that also includes lobsters and crayfish.
Arthropods: Centipedes, Millipedes, Spiders, and More  
Did you know the first arthropods appeared during the early Cambrian Period? They are thought to have evolved from annelids between 500 and 600 million years ago.
 
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This house centipede belongs to the myriapods, a group of arthropods that includes more than 13,000 species.
Myriapods: The Many-Legged Arthropods  

Myriapods are a group of arthropods that includes millipedes, centipedes, pauropods, and symphylans.

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