Phidippus clarus
| Phidippus clarus | |
|---|---|
| |
| Male | |
| |
| Eastern female | |
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Subphylum: | Chelicerata |
| Class: | Arachnida |
| Order: | Araneae |
| Infraorder: | Araneomorphae |
| Family: | Salticidae |
| Subfamily: | Salticinae |
| Genus: | Phidippus |
| Species: | P. clarus
|
| Binomial name | |
| Phidippus clarus Keyserling, 1884[1]
| |
Phidippus clarus, also known as the brilliant jumping spider, is a
P. clarus is a relatively large salticid that is able to take prey up to the size of an adult earwig. In an experiment, P. clarus was offered as many fruit flies as it could eat in a four-hour session. On average individuals took 17 flies, with the maximum amount taken was a striking 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 females produce the most eggs and are the quickest at producing. If a female that has mated already finds another 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
Taxonomy
Phidippus clarus is one of the 60 species in the genus Phidippus,[2]: vii and one of about 5,000 in the Salticidae, a family that accounts for about 10% of all spider species.[3]
Description
Jumping spiders have a distinctive rectangular carapace,[4]: 51 and that of female Phidippus clarus average 4.05 millimetres (0.159 in) wide, while the carapaces of males average 3.20 millimetres (0.126 in).[5]
They are typically a red/brown coloration, but can sometimes be a lighter yellow or brown with darker markings on their bodies.[5]
Habitat and distribution
Phidippus clarus is found in old fields throughout most of the
Feeding
Almost all jumping spiders are
After capturing the prey, P. clarus settles in one spot and does not move again until it has discarded the undigestible hard remains of the prey. If P. clarus has gone without food for a few days, it eats slowly.[11]: 147
P. clarus, which is large by the standards of salticids, takes prey up to the size of an adult earwig.[12] In an experiment, when jumping spider were offered as many fruit flies as they could eat within a 4-hour sessions, specimens took 17 flies on average—while one took 41.[10] When the courtship display of wolf spider Schizocosa ocreata combines visual signals with vibrations, P. clarus responds to its wolf spider prey more quickly than when the wolf spider presents only one of the types of signal.[13]
Reproduction and lifecycle
Reproduction
Phidippus clarus becomes adult in early summer,[7]: 278 and females about to lay eggs can weigh 400 milligrams (0.014 oz).[7]: 278 [7]: 12–13 Early in the breeding season, in early to mid-July, there are more males than females. The females all become sexually mature at the same time. At this point of the breeding season males die off, so that the number of males becomes equal to or slightly smaller than the number of females.[6] By August, most females live in their nests overnight for increasing periods, as this is where they will lay eggs.[1] The nests are located in rolled up leaves[14] and are made of thick silk, which is expensive to build. The egg sacs are conspicuous, as they are made of such thick silk.[5] Tests show that females use visual landmarks to return to their nests. A male only remains at the same nest when paired with a female.[1]
Like other spiders and many other arthropods, P. clarus can vibrate surfaces to interact with others of its species, sometimes in conjunction with other communications such as movements, to intimidate rivals and woo mates.[6]
Brood size
One mated female P. clarus can lay well over 100 eggs per sac in a thick silken cocoon.[4]: 52 An average clutch contains 135 eggs.[5] Most females bear only one clutch of eggs,[11]: 136–137 but some lay more.[1] The females stay with the egg cocoon and usually die a few days after the spiderlings leave the nest.[11]: 136–137
Early life
The egg
Mating
Male/male interactions
Competitions between P. clarus males occur on leaves up to 5 cm (2.0 in) long and wide, and the prize is the right to cohabit in the nest of a sub-adult female who is about enter her last molt and become fertile.[15] Initially, the contending males use vibration and visual displays, and the number of vibration signals often determines which male wins.[6] Males may use "leg-fencing", trying to push each other backwards with their front legs and bodies. Some of these contests escalate to grappling, in which males lock chelicerae (jaws) and legs for relatively longer periods.[15] In contests, males with previous experience of winning are more likely to win later contests, and males with more experience of losing are more likely to lose in future. In both winners and losers, more recent experience is more important than earlier experience. However, the weights of the contenders has the most influence, and experience makes a difference only between individuals of similar size.[15]
Female/female interactions
In contests between P. clarus females, the preliminaries are longer but ritualized displays are rare. Physical fights between females are more likely to end in injury or death.[16]
Female/male interaction
Pheromones
Males of P. clarus can detect females' size and age based on pheromones and other chemicals left in females' silk, and males use this information to choose mates. Males prefer to cohabit with large females, which mature more quickly and have more offspring than smaller ones. The largest males are the most aggressive and thus the largest males and females mate, and so on in order of size.[6]
Courting
When P. clarus males find females, the males court by waving their legs and making their abdomens vibrate against the substrate (leaves, the ground, etc.). Males will court immature and adult virgin females, and also previously mated females.[6] As the male dances, he approaches the female and touches the female cautiously once or twice. The female rejects the male by extending her first pair of legs whenever he approaches too closely, or shows acceptance by not blocking his advance. If accepted, the male climbs over her and uses his forelegs to turn her abdomen to the side. The turn exposes her genital pore, which lies on the underside of the abdomen, and the male inserts one semen-laden pedipalp. After two or three minutes the male withdraws this pedipalp, turns the female's abdomen the other way and inserts the other pedipalp.[11]: 138–140 Some P. clarus females mate with more than one male. In these females, copulations after the first occur after longer courtships. This shows that already-mated females are less receptive to mates, and suggests that females may be trading up in subsequent matings.[14]
Enemies
Parasites
The Californian wasp Aporinellus completus parasitizes P. clarus by paralyzing the spider and attaching an egg to the spider's abdomen.[17]: 88–89 Mermithid nematodes infest P. clarus and many other spiders, typically severely damaging the main muscles, the digestive system and the reproductive system.[18]
Biocontrol
In an experiment in 2006, P. clarus showed promise for
References
- ^ S2CID 198126575. Archived from the original(PDF) on 14 June 2010. Retrieved 25 April 2011.
- ^ a b c d Edwards, G.B (2004). "Revision of the jumping spiders of the genus Phidippus (Araneae: Salticidae)". Occasional Papers of the Florida State Collection of Arthropods. 11: vii, 1–156.
- ^ ISBN 978-1-4020-6242-1. Retrieved 11 April 2011.
- ^ . Retrieved 27 April 2011.
- ^ )
- ^ . Retrieved 22 April 2011.
- ^ ISBN 978-0-674-02480-9. Retrieved 24 April 2011.
Phidippus clarus.
- ISSN 1944-8120. Retrieved 12 April 2011.
- ^ Ehmann, William J. (December 2, 2002). "Conservation Biology of Special Concern Jumping Spiders (Araneae: Salticidae) of Minnesota" (PDF). Conservation Biology Research Grants Program. Minnesota Department of Natural Resources. Retrieved 28 April 2011.
- ^ . Retrieved 24 April 2011.
- ^ .
- S2CID 73518332. Archived from the original(PDF) on 14 August 2011. Retrieved 26 April 2011.
- .
- ^ . Retrieved 25 April 2011.
- ^ PMID 20161296.
- doi:10.1093/beheco/arq073. Archived from the original(PDF) on 1 April 2011. Retrieved 26 April 2011.
- ISBN 978-0-520-09957-9. Retrieved 24 April 2011.
- ^ Poinar, G.O. Jr (1985). "Mermithid (Nematoda) parasites of spiders and harvestmen" (PDF). Journal of Arachnology. 13: 121–128. Retrieved 26 April 2011.
External links
