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Phidippus johnsoni, the red-backed jumping spider or Johnson jumping spider, is one of the largest and most commonly encountered jumping spiders of western North America. It is not to be confused with the unrelated and highly venomous redback spider ( Latrodectus hasselti ).
The spiders dig a burrow up to 55 cm deep, with two trapdoors. Females are approximately 35 mm long, stout, short-legged, and mostly dark brown to black (but the jaws are sometimes red-tinged). The smaller males are approximately 15 mm long, have longer and thinner legs, and the head and jaws are bright red while the abdomen is gunmetal blue to ...
“The hobo spider can inflict a painful bite that results in localized red swelling and some pain, but no necrotic lesion,” Potzler says. Usually, symptoms will get better within 24 hours with ...
Females can reach 12 mm body length, males 7 to 11 mm. Both sexes have blue-green iridescent chelicerae, a black cephalothorax and limbs, and a bright red abdomen with a median black stripe (similar to the female P. johnsoni). Between the black and red areas on the posterior part of the dorsal abdomen there are two minute white spots.
Male body length ranges from 4 to 6 mm. V. arenata are polychromatic and their abdomen color ranges from white to yellow. [6] Some smaller, vein-like markings on the abdominal area are red. [4] Females can have black, brown, or rusty red colored legs and carapace. The head is small compared to this spider's triangular abdomen.
The eye arrangement of spiders in the genus Latrodectus. Female widow spiders are typically dark brown or a shiny black in colour when they are full grown, usually exhibiting a red or orange hourglass on the ventral surface (underside) of the abdomen; some may have a pair of red spots or have no marking at all.
They spin webs as thick as 10 feet wide and offer several benefits of sticking (or spinning) around.
Black widow spider bites require immediate medical attention. Call 911 immediately if you think you have a black widow spider bite and are having trouble breathing or experiencing full-body ...