Phidippus clarus
| Phidippus clarus | |
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| Male Phidippus clarus | |
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| Female Phidippus clarus from Occoquan Bay National Wildlife Refuge, Woodbridge, Virginia | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Class: | Arachnida |
| Order: | Araneae |
| Family: | Salticidae |
| Genus: | Phidippus |
| Species: | P. clarus |
| Binomial name | |
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Phidippus clarus Keyserling, 1884 |
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Phidippus clarus is a species of jumping spider (family Salticidae) found in old fields throughout eastern North America. It often waits upside down near the top of a plant, which may be useful for detecting prey, and then quickly jumps down before the prey can escape. The spider is one of 60 species in the genus Phidippus, and one of about 5,000 in the Salticidae, a family that accounts for about 10% of all spider species.P. clarus is a predator, mostly taking insects, other spiders, and other terrestrial arthropods.
Like other jumping spiders, it has vision more acute than a cat and ten times more acute than a dragonfly. The eyes are used to locate prey and rivals, and find and court mates. All spiders have sensors for smell, taste, touch and vibration protruding through their cuticle ("skin").
Jumping spiders can leap up to 50 times their own length by powerfully extending the third or fourth pairs of legs, with the longer forelimbs extended to grasp the prey. P. clarus, a relatively large salticid, takes prey up to the size of an adult earwig. In an experiment, P. clarus was offered as many fruit flies as it could eat, and in four-hour sessions individuals took 17 flies on average – while one took 41.
When P. clarus males compete for females, the winners are those that produce the most vibrations on the surface and those that are largest. Contests between females involve less displaying, and physical fights between females are more likely to end in injury or death. The most successful males choose the largest females, as these produce the most eggs and most quickly. If a female that has mated already then finds a larger male, she will often mate again with the larger male. The average clutch is 135 eggs. Unlike most of the genus Phidippus, P. clarus females die after one brood has left the nest.
P. clarus is parasitized by the Californian wasp Aporinellus completus and by mermithid nematodes. In an experiment in 2006, P. clarus showed promise for controlling the fourlined plant bug, Poecilocapsus lineatus, which severely damages the commercially grown sweet basil.
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Wikipedia