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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 ).
Latrodectus hesperus, the western black widow spider or western widow, is a venomous spider species found in western regions of North America. The female's body is 14–16 mm (1/2 in) in length and is black, often with an hourglass-shaped red mark on the lower abdomen. This "hourglass" mark can be red, yellow, and on rare occasions, white.
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.
“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 ...
True to their name, female Black Widow spiders have shiny black bodies and a red hourglass shape on the underside of their abdomen. Females are traditionally larger than males, their bodies can ...
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.
This is a burrowing spider and ranges in color from a dull black and gray to a rusty orange/brown. It is black when freshly moulted (post-moult) and turns brown just before a moult (pre-moult). Its eyes are small and weak and only able to judge light levels. Its abdomen is oval in shape with a diameter up to 4 inches (10 cm).
They spin webs as thick as 10 feet wide and offer several benefits of sticking (or spinning) around.