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Crab Spider (Tmarus spp.)


Detailing the physical features, habits, territorial reach and other identifying qualities of the Crab Spider


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Image Credit: Cline J. from Louisville, KY
Full-sized image of the Crab-Spider-Tmarus Thumbnail image of the Crab-Spider-Tmarus

Crab Spiders quirky way of walking and abnormally long front legs hint at their distant relationship to familiar marine crabs.



Updated: 01/26/2021; Authored By Staff Writer; Content ©www.InsectIdentification.org
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.©InsectIdentification.org


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General Characteristics


Capability, Shape, Texture/Pattern, Benefits, Dangers
Venomous insect icon


Taxonomic Hierarchy


Species Breakdown
Kingdom: Animalia
  Phylum: Arthropoda
    Class: Arachnida
      Order: Araneae
        Family: Thomisidae
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          Genus: Tmarus
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            Species: spp.

Identifying Information


Size, Colors, Features
Scientific Name: Tmarus spp.
Category: Spider
Size (Adult; Length): 3mm to 5mm (0.11" to 0.19")
Colorwheel Graphic Colors: brown, tan
Descriptors: legs, straight, front, skinny, venomous


Relative Size Comparison


Typical Size Between 3mm (0.1in) and 5mm (0.2in)
Lo: 3mm
Md: 4mm
Hi: 5mm

Territorial Map*


U.S., Canada, and Mexico
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Territory map graphic of the country of Mexico
Contiguous United States shape map layer graphic
Alaska  
Hawaii  
Prince Edward Is.  
* MAP NOTES: The territorial heat map above showcases (in red) the states and territories of North America where the Crab Spider may be found (but is not limited to). This sort of data is useful when attempting to see concentrations of particular species across the continent as well as revealing possible migratory patterns over a species' given lifespan. Some insects are naturally confined by environment, weather, mating habits, food resources and the like while others see widespread expansion across most, or all, of North America. States/Territories shown above are a general indicator of areas inhabited by the Crab Spider. Insects generally go where they please, typically driven by diet, environmental changes, and / or mating habits.
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