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Jumping spider

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Jumping spiders
Temporal range:Paleogene–present
Adult femalePlatycryptus undatus
Scientific classificationEdit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Subphylum: Chelicerata
Class: Arachnida
Order: Araneae
Infraorder: Araneomorphae
Family: Salticidae
Blackwall,1841
Genera

SeeList of Salticidae genera.

Diversity
600+ genera, 6000+ species

Jumping spidersare a group ofspidersthat constitute thefamilySalticidae.As of 2019, this family contained over 600 described genera and over 6,000 describedspecies,[1]making it the largest family of spiders at 13% of all species.[2]Jumping spiders have some of the best vision amongarthropodsand use it in courtship, hunting, and navigation. Although they normally move unobtrusively and fairly slowly, most species are capable of very agile jumps, notably when hunting, but sometimes in response to sudden threats or crossing long gaps. Both theirbook lungsandtracheal systemare well-developed, and they use both systems (bimodal breathing). Jumping spiders are generally recognized by their eye pattern. All jumping spiders have four pairs of eyes, with theanterior medianpair being particularly large.

Description[edit]

Salticidae male anterior and dorsal aspects, showing positions of eyes
Aregal jumperstaying near its shelter on athistle.It attempts to capture a small winged insect.

Jumping spiders are among the easiest to distinguish from similar spider families because of the shape of thecephalothoraxand their eye patterns. The families closest to Salticidae in general appearance are theCorinnidae(distinguished also by prominent spines on the back four legs), theOxyopidae(the lynx spiders, distinguished by very prominent spines on all legs), and theThomisidae(the crab spiders, distinguished by their front four legs, which are very long and powerful). None of these families, however, have eyes that resemble those of the Salticidae. Conversely, the legs of jumping spiders are not covered with any very prominent spines. Their front four legs generally are larger than the hind four, but not as dramatically so as those of the crab spiders, nor are they held in the outstretched-arms attitude characteristic of the Thomisidae.[3]In spite of the length of their front legs, Salticidae depend on their rear legs for jumping. The generally larger front legs are used partly to assist in grasping prey,[4]and in some species, the front legs andpedipalpsare used in species-recognition signaling.

The jumping spiders, unlike the other families, have faces that are roughly rectangular surfaces perpendicular to their direction of motion. In effect this means that their forward-looking, anterior eyes are on "flat faces", as shown in the photographs. Their eye pattern is the clearest single identifying characteristic. They have eight eyes, as illustrated.[3][4]Most diagnostic are the front row of four eyes, in which the anterior median pair are more dramatically prominent than any other spider eyes apart from the posterior median eyes of theDeinopidae.There is, however, a radical functional difference between the major (anterior median) eyes of Salticidae and the major (posterior median) eyes of the Deinopidae; the large posterior eyes of Deinopidae are adapted mainly to vision in dim light, whereas the large anterior eyes of Salticidae are adapted to detailed, three-dimensional vision for purposes of estimating the range, direction, and nature of potential prey, permitting the spider to direct its attacking leaps with great precision. The anterior lateral eyes, though large, are smaller than the anterior median eyes and provide a wider forward field of vision.

The rear row of four eyes may be described as strongly bent, or as being rearranged into two rows, with two large posterior lateral eyes being the furthest back. They serve for lateral vision. The posterior median eyes also have been shifted out laterally, almost as far as the posterior lateral eyes. They are usually much smaller than the posterior lateral eyes and there is doubt about whether they are at all functional in many species.

The body length of jumping spiders generally ranges from 1 to 25 mm (0.04–0.98 in).[3][5]The largest isHyllusgiganteus,[5]while other genera with relatively large species includePhidippus,PhilaeusandPlexippus.[6]

In addition to using theirsilkfor safety lines while jumping, they also build silken "pup tents", where they take shelter from bad weather and sleep at night.[7]They molt in these shelters, build and store egg cases in them, and also spend the winter in them.[8]

Their body's sensory hairs are able to detect airborne acoustic stimuli up to 3 m away.[9]

Vision[edit]

The visual fields of a jumping spider
The eight eyes of aTelamonia dimidiatalocated near the front
Adult malePhidippus audax

Jumping spiders have four pairs of eyes; three secondary pairs that are fixed and a principal pair that is movable.

The posterior median eyes arevestigialin many species, but in some primitive subfamilies, they are comparable in size with the other secondary eyes and help to detect motion.[10]While unable to form images, the reduced pair of eyes is thought to have a role similar to that of insect ocelli by receiving light from the sky. The photoreceptors in the other secondary pairs are almost exclusively green-sensitive, but the posterior median eyes have two visualopsinsdifferent from those in all the other eyes, sensitive to blue and UV light.[11]

The posterior lateral eyes (PLEs) are wide-angle motion detectors that sense motions from the side and behind. Combined with the other eyes, PLEs give the spider a near 360° view of the world.

The anterior lateral eyes (ALEs) have the bestvisual acuityof the secondary eyes.[12]They are able to distinguish some details, as well, and without them, no "looming response" can be triggered by motion.[13]Even with all the other pairs covered, jumping spiders in a study could still detect, stalk, and attack flies, using their ALEs only, which are also sufficiently widely spaced to provide stereoscopic vision.[14]

Theanteriormedian eyes have very goodvision.This pair of eyes is built like a telescopic tube with a corneal lens in the front and a second lens in the back that focus images onto a four-layered retina, a narrow, boomerang-shaped strip oriented vertically.[15][16]Physiological experiments have shown they may have up to four different kinds of receptor cells, with differentabsorption spectra,giving them the possibility oftetrachromaticcolor vision,with sensitivity extending into theultraviolet(UV) range.[17]As the eyes are too close together to allowdepth perception,and the animals do not make use ofmotion parallax,they have instead evolved a method called image defocus. Of the four photoreceptor layers in the retina, the two closest to the surface contain a UV-sensitive opsin (visual pigment), while the two deepest contain a green-sensitive opsin. The incoming green light is only focused on the deepest layer, while the other one receives defocused or fuzzy images. By measuring the amount of defocus from the fuzzy layer, calculating the distance to the objects in front of them is possible.[18][19]In addition to receptor cells, red filters also have been detected, located in front of the cells that normally register green light.[20]All salticids, regardless of whether they have two, three, or four kinds of color receptors, seemingly are highly sensitive to UV light.[17]Some species (such asCosmophasis umbratica) are highlydimorphicin the UV spectrum, suggesting a role in sexual signaling.[21]Color discrimination has been demonstrated in behavioral experiments.

The anterior median eyes have high resolution (11minvisual angle),[22]but the field of vision is narrow, from 2 to 5°. The central region of the retina, where acuity is highest, is no more than six or seven receptor rows wide. However, the eye can scan objects off the direct axis of vision. As the lens is attached to the carapace, the eye's scanning movements are restricted to its retina through a complicated pattern of translations and rotations.[23]This dynamic adjustment is a means of compensation for the narrowness of the static field of vision. Movement of the retina in jumping spiders is analogous to the way manyvertebrates,such asprimates,move their entire eyes to focus images of interest onto theirfovea centralis.In jumping spiders with a translucent carapace, such movements within the jumping spider's eyes are visible from outside when the attention of the spider is directed to various targets.[24]

Behavior[edit]

Jumping[edit]

Unidentified salticid jumping with trailing dragline

Many other arthropods are known to jump, including grasshoppers, fleas, leafhoppers, andsand fleas.Jumping spiders are different from these animals because they are able to make accurate, targeted jumps. Jumps are used for navigation, to escape danger, and to catch prey. When jumping, they use mainly their third or fourth pair of legs, or both pairs, depending on species.[25]Jumping spiders' well-developed internalhydraulicsystem extends their limbs by altering the pressure of their body fluid (hemolymph) within them.[26]This enables the spiders to jump without having large muscular legs like agrasshopper.The maximum horizontal jump distance varies greatly between species, with some capable of jumping two or three body lengths, while the jump of an individualColonus puerperuswas measured at 38 times the body length.[27]The accuracy of their jumps is mediated by their well-developed visual system and the ability to quickly process visual information to tailor each jump.[28][29]When a jumping spider moves from place to place, and especially just before it jumps, ittethersa filament ofsilk(or 'dragline') to whatever it is standing on.[3][5]This dragline provides a mechanical aid to jumping, including braking and stabilization[28][30]and if the jump should fail, the spider climbs back up the dragline.[8]

Hunting[edit]

Heavy-bodied jumpereating another jumping spider

The hunting behaviour of the Salticidae is confusingly varied compared to that of most spiders in other families.[31]Salticids hunt diurnally as a rule, which is consistent with their highly developed visual system. When it detects potential prey, a jumping spider typically begins orienting itself by swiveling itscephalothoraxto bring the anterior median eyes to bear. It then moves itsabdomeninto line with its cephalothorax. After that, it might spend some time inspecting the object of its attention and determining whether a camouflaged or doubtful item of prey is promising, before it starts to stalk slowly forward. When close enough, the spider pauses to attach a dragline, then springs onto the prey.

Many variations on the theme and many surprising aspects exist. For one, salticids do not necessarily follow a straight path in approaching prey. They may follow a circuitous course, sometimes even a course that takes the hunter through regions from which the prey is not visible. Such complex adaptive behaviour is hard to reconcile with an organism that has such a tiny brain, but some jumping spiders, in particular some species ofPortia,can negotiate long detours from one bush down to the ground, then up the stem of another bush to capture a prey item on a particular leaf.[32]Such behaviour still is the subject of research.[31]

Some salticid species are continually on the move, stopping periodically to look around for prey, which they then stalk immediately. Others spend more time scanning their surroundings from one position, actively stalking any prey they detect. Members of the genusPhaeaciustake that strategy to extremes; they sit on a tree trunk, facing downwards and rarely do any stalking, but simply lunge down on any prey items that pass close before them.[31]

Some Salticidae specialise in particular classes of prey, such asants.Most spiders, including most salticids, avoid worker ants, but several species not only eat them as a primary item in their diets, but also employ specialised attack techniques;Anasaitis canosa,for example, circles around to the front of the ant and grabs it over the back of its head. Suchmyrmecophagousspecies, however, do not necessarily refuse other prey items, and routinely catch flies and similar prey in the usual salticid fashion, without the special precautions they apply in hunting dangerous prey such as ants. Ants offer the advantages of being plentiful prey items for which little competition from other predators occurs, but catching less hazardous prey when it presents itself remains profitable.[31]

Some of the most surprising hunting behaviours occur among thearaneophagousSalticidae, and vary greatly in method. Many of the spider-hunting species quite commonly attack other spiders, whether fellow salticids or not, in the same way as any other prey, but some kinds resort to web invasion; nonspecialists such asPhidippus audaxsometimes attack prey ensnared in webs, basically in acts ofkleptoparasitism;sometimes they leap onto and eat the web occupant itself, or simply walk over the web for that purpose.

Salticidae in the generaBrettus,Cyrba,Gelotia,andPortiadisplay more advanced web-invasion behavior. They slowly advance onto the web and vibrate the silk with their pedipalps and legs. In this respect, their behaviour resembles that of theMimetidae,probably the most specialised of the araneophagous spider families. If the web occupant approaches in the manner appropriate to dealing with ensnared prey, the predator attacks.[31]

The foregoing examples present the Salticidae as textbook examples of active hunters; they would hardly seem likely to build webs other than those used in reproductive activities, and in fact, most species really do not build webs to catch prey. However, exceptions occur, though even those that do build capture webs generally also go hunting like other salticids. SomePortiaspecies, for example, spin capture webs that are functional, though not as impressive as some orb webs of theAraneidae;Portiawebs are of an unusual funnel shape and apparently adapted to the capture of other spiders.Spartaeusspecies, though, largely capture moths in their webs. In their review of theethologyof the Salticidae, Richman and Jackson speculate on whether such web building is a relic of the evolution of this family from web-building ancestors.[31]

In hunting, the Salticidae also use their silk as a tether to enable them to reach prey that otherwise would be inaccessible. For example, by advancing towards the prey to less than the jumping distance, then retreating and leaping in an arc at the end of the tether line, many species can leap onto prey on vertical or even on inverted surfaces, which of course would not be possible without such a tether.

Having made contact with the prey, hunting Salticidae administer a bite to inject rapid-acting venom that gives the victim little time to react.[33]In this respect, they resemble the Mimetidae and Thomisidae, families that ambush prey that often are larger than the predator, and they do so without securing the victim with silk; they accordingly must immobilise it immediately and their venom is adapted accordingly.

This small female jumping spider (Hyllus semicupreus) successfully captured a grasshopper that is much larger and stronger than she is. The grasshopper tried to escape, but the spider immobilized it using the venom she injected, and the "dragline" helped her hold her position with respect to the prey object.

Diet[edit]

A camouflagedMenemerus bivittatusjumping spider with a captured male ant

Although jumping spiders are generallycarnivorous,many species have been known to includenectarin their diets,[34]and one species,Bagheera kiplingi,feeds primarily on plant matter.[35]None are known to feed on seeds or fruit.Extrafloral nectarieson plants, such asChamaecrista fasciculata(partridge pea), provide jumping spiders with nectar; the plant benefits accordingly when the spiders prey on whatever pests they find.

The female of the Southeast Asian speciesToxeus magnusfeeds its offspring with a milky, nutritious fluid for the first 40 days of their lives.[36]

Reproduction[edit]

Courtship display ofSaitis barbipesjumping spider

Courtship and mating behavior[edit]

Jumping spiders conduct complex, visual courtship displays using movements and physical bodily attributes. A form ofsexual dimorphism,the males possess plumose hairs, colored or iridescent hairs (particularly pronounced in thepeacock spiders), front leg fringes, structures on other legs, and other, often bizarre, modifications. These characteristics are used in a courtship "dance" in which the colored or iridescent parts of the body are displayed. In addition to displaying colors, jumping spiders perform complex sliding, vibrational, or zigzag movements to attract females. Many males have auditory signals, as well. These amplified sounds presented to the females resemble buzzes or drum rolls.[37]Species vary significantly in visual and vibratory components of courtship.[38]The ability to sense UV light (see Vision section) is used by at least one species,Cosmophasis umbratica,in courtship behavior,[39][40]though it is reasonable to assume that many other species exhibit this characteristic.Cosmophasis umbraticamales have markings that are only visible in UV and the females use the markings formate choice.[41]

If receptive to the male, the female assumes a passive, crouching position. In some species, the female may vibrate herpalpsor abdomen. The male then extends his front legs towards the female to touch her. If the female remains receptive, the male climbs on her back and inseminates her with his palps.[42]

Consequences of sexual dimorphism[edit]

Maintaining colorful ornamentation may seem strictly beneficial to sexual selection, yet costs to maintain such distinguishing characteristics occur.[41]While colorful or UV-reflecting individuals may attract more female spiders, it can also increase the risk of predation.[16]

Taxonomy[edit]

See also:List of Salticidae genera
Classification within the spiders (Araneae)[43]

Themonophylyof the family Salticidae is well established through bothphylogeneticandmorphologicalanalyses. Thesister groupto Salticidae is the familyPhilodromidae.[44][45]Synapomorphiesof the two families include loss of cylindrical glandspigotsand loss oftapetain theindirect eyes.[45]

A 2015 revision of the Salticidae family divided it into seven subfamilies:[46]

The Salticinae subfamily is the most diverse, comprising over 90% of the known species of jumping spiders.[46]

Habitat[edit]

Diamorphic jumping spiderin familySalticidaeon tree trunk.

Jumping spiders live in a variety of habitats.Tropical forestsharbor the most species, but they are also found intemperate forests,scrubland,deserts,intertidal zones,and mountainous regions.Euophrys omnisuperstesis the species reported to have been collected at the highest elevation, on the slopes ofMount Everest.[48]

Models for mimicry[edit]

Some small insects are thought to have evolved an appearance or behavioural traits that resemble those of jumping spiders and this is suspected to prevent their predation, specifically from jumping spiders. Some examples appear to be provided by patterns on the wings of sometephritidflies,[49][50]the nymph of afulgorid[51]and possibly some moths.[52]

Fossils[edit]

Very few jumping spiderfossilshave been found. Of those known, all are fromCenozoic eraamber.The oldest fossils are fromBaltic amberdating to theEoceneepoch, specifically, 54 to 42 million years ago. Other fossil jumping spiders have been preserved withinChiapas amberandDominican amber.[53]

See also[edit]

References[edit]

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Further reading[edit]

External links[edit]

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