Crab Spiders quirky way of walking and abnormally long front legs hint at their distant relationship to familiar marine crabs.
Crab Spiders have front legs that are considerably longer than the back pairs. Species in the Tmarus genus tend to stretch them out in front of themselves while resting on branches and twigs. This position resembles that seen in Long-jawed Spiders and can make it difficult to recognize that they are spiders. Tmarus Crab Spiders have brown mottled coloring that camouflages them, adding to their inconspicuous habits.
Crab Spiders are active hunters and do not spin webs to trap prey. Their ability to blend in with foliage makes it easier for them to capture unsuspecting insects. The longer front legs can be useful in holding down insects while trying to bite them. Crab Spiders wander indoors sometimes, but are usually found in gardens and on plants.
Scientific Name: Tmarus spp.
Size (Adult; Length): 3mm to 5mm (0.12in to 0.20in)
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Legs: Spiders have four pairs of legs and these are attached to the cephalothorax.
Pedipalps: Small appendages near the mouth used as taste and smell organs.
Cephalothorax: Contains eyes, head, mouthparts, and legs.
Abdomen: Contains various organs related to digestion, reproduction, and web-making.
Spinnerets: Used in the production of spider silk for fashioning webs or catching prey.
NOTE: Unlike insects, spiders have both an endoskeleton (internal) and exoskeleton (external).