Sections of the Body:

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Topographic Characteristics

From the side view, it's easy to see the numerous spines and ridges of the horseshoe. It is along these ridges and spines that the crab has the largest number of sensing "cuticles" or cuticle receptors, called peg sensilla. (For more, see the Nervous System.)

The density of these range from about 15 per square centimeter on the upper prosoma to 650 per square centimeter along the ridges near the compound eyes.

Illustration (modified) by Carl Shuster