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Get A Free Quote. An abnormal fear of spiders is called arachnophobia. Spiders are chelicerates and therefore arthropods. In fact, chelicerates' only appendages ahead of the mouth are a pair of chelicerae , and they lack anything that would function directly as "jaws".
Spiders and scorpions are members of one chelicerate group, the arachnids. The upper sections generally have thick "beards" that filter solid lumps out of their food, as spiders can take only liquid food.
In spiders, the cephalothorax and abdomen are joined by a small, cylindrical pedicel , which enables the abdomen to move independently when producing silk.
The upper surface of the cephalothorax is covered by a single, convex carapace , while the underside is covered by two rather flat plates. The abdomen is soft and egg-shaped.
It shows no sign of segmentation, except that the primitive Mesothelae , whose living members are the Liphistiidae , have segmented plates on the upper surface.
Like other arthropods, spiders are coelomates in which the coelom is reduced to small areas round the reproductive and excretory systems.
Its place is largely taken by a hemocoel , a cavity that runs most of the length of the body and through which blood flows. The heart is a tube in the upper part of the body, with a few ostia that act as non-return valves allowing blood to enter the heart from the hemocoel but prevent it from leaving before it reaches the front end.
Hence spiders have open circulatory systems. Spiders have developed several different respiratory anatomies, based on book lungs , a tracheal system, or both.
Mygalomorph and Mesothelae spiders have two pairs of book lungs filled with haemolymph, where openings on the ventral surface of the abdomen allow air to enter and diffuse oxygen.
This is also the case for some basal araneomorph spiders, like the family Hypochilidae , but the remaining members of this group have just the anterior pair of book lungs intact while the posterior pair of breathing organs are partly or fully modified into tracheae, through which oxygen is diffused into the haemolymph or directly to the tissue and organs.
Uniquely among chelicerates , the final sections of spiders' chelicerae are fangs, and the great majority of spiders can use them to inject venom into prey from venom glands in the roots of the chelicerae.
Some pump digestive enzymes from the midgut into the prey and then suck the liquified tissues of the prey into the gut, eventually leaving behind the empty husk of the prey.
Others grind the prey to pulp using the chelicerae and the bases of the pedipalps , while flooding it with enzymes; in these species, the chelicerae and the bases of the pedipalps form a preoral cavity that holds the food they are processing.
The stomach in the cephalothorax acts as a pump that sends the food deeper into the digestive system. The midgut bears many digestive ceca , compartments with no other exit, that extract nutrients from the food; most are in the abdomen, which is dominated by the digestive system, but a few are found in the cephalothorax.
Most spiders convert nitrogenous waste products into uric acid , which can be excreted as a dry material.
Malphigian tubules "little tubes" extract these wastes from the blood in the hemocoel and dump them into the cloacal chamber, from which they are expelled through the anus.
The basic arthropod central nervous system consists of a pair of nerve cords running below the gut, with paired ganglia as local control centers in all segments; a brain formed by fusion of the ganglia for the head segments ahead of and behind the mouth, so that the esophagus is encircled by this conglomeration of ganglia.
Despite the relatively small central nervous system, some spiders like Portia exhibit complex behaviour, including the ability to use a trial-and-error approach.
Spiders have primarily four pairs of eyes on the top-front area of the cephalothorax, arranged in patterns that vary from one family to another. However, in spiders these eyes are capable of forming images.
Unlike the principal eyes, in many spiders these secondary eyes detect light reflected from a reflective tapetum lucidum , and wolf spiders can be spotted by torchlight reflected from the tapeta.
On the other hand, jumping spiders' secondary eyes have no tapeta. Other differences between the principal and secondary eyes are that the latter have rhabdomeres that point away from incoming light, just like in vertebrates, while the arrangement is the opposite in the former.
The principal eyes are also the only ones with eye muscles, allowing them to move the retina. Having no muscles, the secondary eyes are immobile.
Some jumping spiders' visual acuity exceeds by a factor of ten that of dragonflies , which have by far the best vision among insects ; in fact the human eye is only about five times sharper than a jumping spider's.
They achieve this by a telephotographic series of lenses, a four-layer retina and the ability to swivel their eyes and integrate images from different stages in the scan.
The downside is that the scanning and integrating processes are relatively slow. There are spiders with a reduced number of eyes.
Of these, those with six eyes such as Periegops suterii are the most numerous and are missing a pair of eyes on the anterior median line ;  other species have four eyes and some just two.
Cave dwelling species have no eyes, or possess vestigial eyes incapable of sight. As with other arthropods, spiders' cuticles would block out information about the outside world, except that they are penetrated by many sensors or connections from sensors to the nervous system.
In fact, spiders and other arthropods have modified their cuticles into elaborate arrays of sensors. Various touch sensors, mostly bristles called setae , respond to different levels of force, from strong contact to very weak air currents.
Chemical sensors provide equivalents of taste and smell , often by means of setae. Males have more chemosensitive bristles on their pedipalps than females.
They have been shown to be responsive to sex pheromones produced by females, both contact and air-borne. Because they are able to tell the sexes apart, it is assumed the blood scent is mixed with pheromones.
In web-building spiders, all these mechanical and chemical sensors are more important than the eyes, while the eyes are most important to spiders that hunt actively.
Like most arthropods, spiders lack balance and acceleration sensors and rely on their eyes to tell them which way is up.
Arthropods' proprioceptors , sensors that report the force exerted by muscles and the degree of bending in the body and joints, are well-understood.
On the other hand, little is known about what other internal sensors spiders or other arthropods may have. Each of the eight legs of a spider consists of seven distinct parts.
The part closest to and attaching the leg to the cephalothorax is the coxa ; the next segment is the short trochanter that works as a hinge for the following long segment, the femur ; next is the spider's knee, the patella , which acts as the hinge for the tibia ; the metatarsus is next, and it connects the tibia to the tarsus which may be thought of as a foot of sorts ; the tarsus ends in a claw made up of either two or three points, depending on the family to which the spider belongs.
Although all arthropods use muscles attached to the inside of the exoskeleton to flex their limbs, spiders and a few other groups still use hydraulic pressure to extend them, a system inherited from their pre-arthropod ancestors.
Most spiders that hunt actively, rather than relying on webs, have dense tufts of fine bristles between the paired claws at the tips of their legs.
These tufts, known as scopulae , consist of bristles whose ends are split into as many as 1, branches, and enable spiders with scopulae to walk up vertical glass and upside down on ceilings.
It appears that scopulae get their grip from contact with extremely thin layers of water on surfaces.
The abdomen has no appendages except those that have been modified to form one to four usually three pairs of short, movable spinnerets , which emit silk.
Each spinneret has many spigots , each of which is connected to one silk gland. There are at least six types of silk gland, each producing a different type of silk.
Silk is mainly composed of a protein very similar to that used in insect silk. It is initially a liquid, and hardens not by exposure to air but as a result of being drawn out, which changes the internal structure of the protein.
In other words, it can stretch much further before breaking or losing shape. Some spiders have a cribellum , a modified spinneret with up to 40, spigots, each of which produces a single very fine fiber.
The fibers are pulled out by the calamistrum , a comblike set of bristles on the jointed tip of the cribellum, and combined into a composite woolly thread that is very effective in snagging the bristles of insects.
The earliest spiders had cribella, which produced the first silk capable of capturing insects, before spiders developed silk coated with sticky droplets.
However, most modern groups of spiders have lost the cribellum. Even species that do not build webs to catch prey use silk in several ways: as wrappers for sperm and for fertilized eggs; as a " safety rope "; for nest-building; and as " parachutes " by the young of some species.
Spiders reproduce sexually and fertilization is internal but indirect, in other words the sperm is not inserted into the female's body by the male's genitals but by an intermediate stage.
Unlike many land-living arthropods ,  male spiders do not produce ready-made spermatophores packages of sperm , but spin small sperm webs onto which they ejaculate and then transfer the sperm to special syringe -styled structures, palpal bulbs or palpal organs, borne on the tips of the pedipalps of mature males.
When a male detects signs of a female nearby he checks whether she is of the same species and whether she is ready to mate; for example in species that produce webs or "safety ropes", the male can identify the species and sex of these objects by "smell".
Spiders generally use elaborate courtship rituals to prevent the large females from eating the small males before fertilization, except where the male is so much smaller that he is not worth eating.
In web-weaving species, precise patterns of vibrations in the web are a major part of the rituals, while patterns of touches on the female's body are important in many spiders that hunt actively, and may "hypnotize" the female.
Gestures and dances by the male are important for jumping spiders , which have excellent eyesight. If courtship is successful, the male injects his sperm from the palpal bulbs into the female via one or two openings on the underside of her abdomen.
Female spiders' reproductive tracts are arranged in one of two ways. The ancestral arrangement "haplogyne" or "non-entelegyne" consists of a single genital opening, leading to two seminal receptacles spermathecae in which females store sperm.
In the more advanced arrangement "entelegyne" , there are two further openings leading directly to the spermathecae, creating a "flow through" system rather than a "first-in first-out" one.
Eggs are as a general rule only fertilized during oviposition when the stored sperm is released from its chamber, rather than in the ovarian cavity.
In these species the female appears to be able to activate the dormant sperm before oviposition, allowing them to migrate to the ovarian cavity where fertilization occurs.
In this species the male will penetrate its pedipalps through the female's body wall and inject his sperm directly into her ovaries, where the embryos inside the fertilized eggs will start to develop before being laid.
Males of the genus Tidarren amputate one of their palps before maturation and enter adult life with one palp only.
In the Yemeni species Tidarren argo , the remaining palp is then torn off by the female. The separated palp remains attached to the female's epigynum for about four hours and apparently continues to function independently.
In the meantime, the female feeds on the palpless male. Observation shows that most male redbacks never get an opportunity to mate, and the "lucky" ones increase the likely number of offspring by ensuring that the females are well-fed.
Some even live for a while in their mates' webs. The tiny male of the Golden orb weaver Trichonephila clavipes near the top of the leaf is protected from the female by producing the right vibrations in the web, and may be too small to be worth eating.
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