What is an arachnid exoskeleton?
Quick Answer
An arachnid exoskeleton is the hard outer covering that supports and protects spiders, scorpions, ticks, and mites. Like insect exoskeletons, it must be shed as the animal grows.
The Full Story
Arachnids, like insects, have an external skeleton made of chitin and proteins. This exoskeleton provides protection, structural support, and surfaces for muscle attachment. Because it does not grow continuously, arachnids must molt periodically, shedding the old outer layer and forming a new one. During and after molting, arachnids are especially vulnerable to injury and predators. The exoskeleton is one reason arachnids can thrive in dry land environments, since it helps reduce water loss.
Key Facts
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