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  • Black Tail Crab Spider - (Synema parvulum)

    Black Tail Crab Spider - (Synema parvulum)

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

    Staff Writer (10/20/2014): Crab spiders have long front forelegs that sit more forward on the body. The back pairs of legs are so much shorter and further back than the front pairs that it gives them the appearance of the kind of crab found in the ocean, on a much, much smaller scale.

    In addition to the typical Crab spider physique, this particular species has a black spot on the tip of the abdomen, as if their 'butts' (abdomen) were dipped in black ink.

    The crab spider does not use a web to catch prey. They ambush insects, lying in wait inside or on flowers. They have also been found on wood or tree bark. The Black Tail Crab Spider will grab its insect prey and use its front legs to help pin the victim down. It then bites the prey with its strong jaws and immobilizes it for consumption.

    Because this spider preys on insects that may damage plants and flowers (like aphids), it is considered helpful to the garden ecosystem.

    The Black Tail Crab Spider is not known to bite humans as it takes little interest in their activity. Their venom is not poisonous to humans. Like most spiders, however, they will defend themselves if provoked, squeezed or threatened.

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    Details of the:
    Black Tail Crab Spider

    Category: Spider
    Common name: Black Tail Crab Spider
    Scientific Name: Synema parvulum

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

    Size (Adult, Length): 5mm to 7mm (0.20in to 0.28in)

    Identifying Colors: brown; black; red

    Additional Descriptors: crab, butt, legs, venomous, biting, helpful

    North American Reach (Though Not Limited To*): Alabama, Arizona, Arkansas, Florida, Georgia, Illinois, Indiana, Kentucky, Louisiana, Mississippi, Missouri, Nevada, New Jersey, New Mexico, North Carolina, Ohio, Oklahoma, South Carolina, Tennessee, Texas, Utah, Virginia, West Virginia

    * Keep in mind that an insect's reach is not limited by lines on a map and therefore may appear in areas/regions/states beyond those listed above.