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Black Tail Crab Spider (Synema parvulum)


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


 Updated: 2/8/2018; Authored By Staff Writer; Content ¬©www.InsectIdentification.org



  Black Tail Crab Spider  
Picture of Black-Tail-Crab-Spider
Picture of Black-Tail-Crab-Spider Picture of Black-Tail-Crab-SpiderPicture of Black-Tail-Crab-SpiderPicture of Black-Tail-Crab-Spider


Though the Black Tail Crab Spider lacks giant claws, it makes up for it with mighty jaws and a great work ethic.





Crab spiders have longer front legs that sit more forward on the body than typical spiders. Their back pairs of legs are so much shorter and further back than the front pairs that it gives them the appearance of a crab. This particular species is very tiny and reddish-brown. The abdomen is wide and round but also flat on top. The bottom has a black crescent-shaped black mark at the end of the abdomen, as if its rear end was dipped in black ink.

Crab spiders do not use a web to catch prey. They ambush insects, lying in wait inside or on flowers. Because this spider preys on insects that may damage plants and flowers (like aphids and certain beetles), it is considered helpful to the garden ecosystem. They have also been found on piled wood and tree bark. The Black Tail Crab Spider will grab its insect prey, using its long and strong front legs to help pin the victim down. It then bites the prey with its strong jaws, immobilizing it with venom for later consumption. The Black Tail Crab Spider is not known to bite humans,however, and it takes little interest in our activity. Their venom is not poisonous.


Basic Information
Common Name: Black Tail Crab Spider
Scientific Name: Synema parvulum
Category: Spider


General Identification
Size (Adult; Length): 5mm to 7mm (0.20in to 0.27in)
Colorwheel Graphic
Identifying Colors: brown; black; red
Additional Descriptors: crab, butt, dipped, crescent, legs, venomous, biting, helpful




Taxonomic Hierarchy
Kingdom: Animalia
Phylum: Arthropoda
Class: Arachnida
Order: Araneae
Family: Thomisidae
Genus: Synema
Species: parvulum


Spider Anatomy (Typical)
Graphic showing basic parts of spider anatomy
1
Legs: Spiders have four pairs of legs and these are attached to the cephalothorax.
2
Pedipalps: Small appendages near the mouth used as taste and smell organs.
3
Cephalothorax: Contains eyes, head, mouthparts, and legs.
4
Abdomen: Contains various organs related to digestion, reproduction, and web-making.
5
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).


Territorial Reach (A-to-Z)
Note: An insect's reach is not limited by lines drawn on a map and therefore species may appear in areas, regions and/or states beyond those listed below as they are driven by environmental factors (such as climate change), available food supplies and mating patterns. Grayed-out selections below indicate that the subject in question has not been reported in that particular territory. U.S. states and Canadian provinces / territories are clickable to their respective bug listings.
Alabama
Alaska
Arizona
Arkansas
California
Colorado
Connecticut
Delware
Florida
Georgia
Hawaii
Idaho
Illinois
Indiana
Iowa
Kansas
Kentucky
Louisiana
Maine
Maryland
Massachusetts
Michigan
Minnesota
Mississippi
Missouri
Montana
Nebraska
Nevada
New Hampshire
New Jersey
New Mexico
New York
North Carolina
North Dakota
Ohio
Oklahoma
Oregon
Pennsylvania
Rhode Island
South Carolina
South Dakota
Tennessee
Texas
Utah
Vermont
Virginia
Washington
West Virginia
Wisconsin
Wyoming
Canadian National Flag Graphic
Alberta
British Columbia
Manitoba
New Brunswick
Newfoundland and Labrador
Nova Scotia
Ontario
Prince Edward Island
Quebec
Saskatchewan
Mexican National Flag Graphic
Mexico


Territorial Area Map (Visual Reference Guide)
The map below showcases (in red) the states and territories of North America where the Black Tail Crab Spider may be found (but is not limited to). This sort of data can be useful in seeing concentrations of a particular species over the continent as well as revealing possible migratory patterns over a species' given lifespan. Some species 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.
Alaska  
Hawaii  
Prince Edward Is.  
State of Alabama graphic
State of Arizona graphic
State of Arkansas graphic
State of California graphic
State of Colorado graphic
State of Delware graphic
State of Florida graphic
State of Georgia graphic
State of Idaho graphic
State of Illinois graphic
State of Indiana graphic
State of Iowa graphic
State of Kansas graphic
State of Kentucky graphic
State of Louisiana graphic
State of Maine graphic
State of Maryland graphic
State of Michigan graphic
State of Minnesota graphic
State of Mississippi graphic
State of Missouri graphic
State of Montana graphic
State of Nebraska graphic
State of Nevada graphic
State of New England graphic
State of New Jersey graphic
State of New Mexico graphic
State of New York graphic
State of North Carolina graphic
State of North Dakota graphic
State of Ohio graphic
State of Oklahoma graphic
State of Oregon graphic
State of Pennsylvania graphic
State of South Carolina graphic
State of South Dakota graphic
State of Tennessee graphic
State of Texas graphic
State of Utah graphic
State of Virginia graphic
State of Washington graphic
State of West Virginia graphic
State of Wisconsin graphic
State of Wyoming graphic
Canadian territory of Alberta graphic
Canadian territory of British Columbia graphic
Canadian territory of Manitoba graphic
Canadian territory of New Brunswick graphic
Canadian territory of Newfoundland and Labrador graphic
Canadian territory of Ontario graphic
Canadian territory of Quebec graphic
Canadian territory of Saskatchewan graphic
Territory map graphic of the country of Mexico
Contiguous United States shape map layer graphic


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