TARANTULA AND SCORPIONS (order basis)
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TARANTULA
Fearsome looking, the tarantulas – diverse and the largest of the spiders – hold a place in the folklore of cultures across the world. Surprisingly, they also become novel and treasured pets in the homes of some people. More surprisingly, they serve as delicacies at the dining tables of indigenous peoples of the Amazon.
Appearance and Anatomy Tarantulas
The body and legs are hairy
Tan to reddish brown to black in color
Body size is to three inches long and two to three inches tall
Leg span of three to five inches
Male tarantulas are longer and slimmer than females
Male tarantulas have much smaller abdomens than females
Exoskeleton (outer shell,) includes a fused head and thorax connected at a narrow waist to an oval-shaped abdomen
Eight marginally functional eyes in two groups on the forehead
Mouth and two backward-pointing fangs below the eyes
Two pedipalps (leg-like appendages) for food handling near the mouth
The abdomen contains several vital organs
The abdomen has silk-producing spinnerets at the tip
Four pairs of legs connect to the fused head and thorax
Worldwide Distribution of Tarantulas
"There are about 850 species [of tarantulas] worldwide," according to Barron's Tarantulas and Other Arachnids, and "Their range includes Africa and Madagascar, parts of the Middle East, southern Europe, southern Asia, the Indo-Pacific region, Australia, northern New Zealand, some of the Micronesian Islands…, all of Central and South America, parts of the Caribbean, and the United States north to central California and east to the Mississippi River." More than four dozen species populate the U. S. range, according to Hendrixson.
Habitat and Prey
Typically, in the southwestern United States, tarantulas live in solitude in desert basins, mountain foothills and forested slopes. They occupy various kinds of nests, with many species taking up residence in burrows or crevices, which may be sequestered in the ground, along cliff faces, among rocks, under tree bark, or between tree roots. Some line the burrow with silk. Some surround the entrance with a silken "welcoming mat," which vibrates like guitar strings, sending signals to the spider, cloistered in its burrow, if potential prey should touch the strands. "A tarantula will attack literally anything that it can subdue: beetles, grasshoppers, locusts, other spider, small lizards and mice," said biologist Fred Punzo, quoted by Pete Taylor in National Wildlife magazine, "Natural Inquiries." Tarantulas kill by injecting venom through their fangs into their prey.
Life Cycle
During mating season, which varies from spring through fall, depending on the species and conditions, the males leave their burrows, sometimes en masse, to seek willing females. A male, encountering the silk surrounding the entrance to a female's burrow, calls and dances amorously. He may be rejected or embraced.In either event, he may get eaten up, becoming "a readily available source of protein to fuel development of the next generation," said Pete Taylor, writing for National Wildlife magazine. Several weeks after mating, the female, said Taylor, produces an egg sac, and six or seven weeks later, "hundreds of tiny spiderlings hatch to begin the cycle anew." After a few weeks, the young disperse to take up their lives. As tarantulas mature, they molt several times, each time shedding their old exoskeleton for a new one. The males may live for several years, the females, for several decades.
A Few Tarantula Facts
The name "tarantula" apparently originated in the 14th century, in the Italian city of Taranto, where people felt compelled to dance the wildly erotic Tarantella if bitten by a spider. --BIRDSPIDERS.COM, Rick C. West, Arachnologist
One Venezuelan species has a leg span of some 11 inches; another South American species, a body diameter of some 2 ˝ inches; an Arizona species, a body length of 1/3 inch. -- BIRDSPIDERS.COM, Rick C. West, Arachnologist
Most American tarantulas have barbed and mildly venomous "urticating" hairs on their abdomens, and they use their legs to "cast" the hairs into the faces of threatening animals, inflicting irritation of soft tissues and eyes. --National Health Museum Internet site, Robert J. Wolff, Ph.D.
Some species have on their feet tiny spinnerets that produce sticky silk patches, helping the spider gain a foothold for climbing on slick surfaces such as window glass. --Live Science Internet site, "Tarantulas Spin Silk From Their Feet, Too," Jeanna Bryner
Some species produce a buzzing sound, like cloth ripping, by rubbing appendages together. --mysticwicks Internet site, "Tarantula"
Tarantulas' fangs move up and down; all other spiders' fangs move horizontally. --Barron's Tarantulas and Other Arachnids
SCORPION
Scorpions are eight-legged venomous invertebrates belonging to the class Arachnida, and the order Scorpiones. They are related to spiders, mites, ticks, and harvestmen as well as other members of the Arachnida class. They possess an extended body and a segmented, erectile tail ending with the telson (the sting). There are roughly 1,300 species of scorpions worldwide.
Description/Identification
Crab-like appearance
Four pairs of legs
A pair of pincers
Long, segmented tail that curls up with a stinger on the end
The scorpion's body has two parts, a cephalothorax which contains the prosoma, or head; and the abdomen. The cephalothorax is covered by the carapace, a hard bony or chitinous outer covering. The carapace usually suports a pair of median eyes at the top center. Two to five pairs of lateral eyes are found at the front corners of the carapace, though a few cave and montane forest litter-dwelling scorpions are eyeless. Chelicerae, the scorpion's mouthparts, and a pair of pedipalps, or claws used for prey capture and mating complete the head anatomy. The pedipalps are covered with trichobothria, sensory setae, that sense air-borne vibrations.
The abdomen is made up of the mesosoma, the main body, and the metasoma, the tail. The mesosoma, protected by bony armour, contains the lungs, digestive organs and ***ual organs, as well as bearing 4 pairs of walking legs and the pectines. The tips of the legs have small organs that detect vibrations in the ground. The pectines are feathery sensory organs which hang beneath the abdomen and trail on the ground. They are coated by chemosensors that provide detection of minute chemical signals that are thought to alert the scorpions to the approach of prey and also to be of use in mating behavior. The respiratory structure, known as "book lungs," are spiracles that open into the scorpion's body. The surfaces of the legs, pedipalps, and body are also covered with thicker hairs that are sensitive to direct touch.
The metasoma curves up and ends in the telson, which bears the bulbous vesicle containing the venom glands and a sharp, curved aculeus which delivers the venom.
Range & Habitat
Though most prolific and diverse in warm habitat, scorpions have adapted to a wide range of environments, including plains and savannahs, deciduous forests, mountainous pine forests, rain forests and caves. Scorpions have been found at elevations of over 12,000 feet in the Andes Mountains in South America and in the Himalayas of Asia, as well as the Alps. In snowy areas, they hibernate during the cold months of the year. In drought areas they may aestivate (pass the summer in a dormant or torpid state).
About 90 species are found in the U.S. All but four of these naturally occur west of the Mississippi River and are abundant in semi-arid regions. The highest concentration of scorpions are found in Arizona, California, New Mexico and Texas.
Interesting Scorpion Facts
*The most dangerous scorpion is the "Deathstalker" or Leiurus quinquestriatus which is prevalent in North Africa and the Middle east.
*Scorpions glow when exposed to an unltraviolet light, like a blacklight, due to flourescent chemicals in the cuticle.
*During courtship the scorpions grasp the pedipalps (pincers) and preferm a dance called the "promenade ŕ deux."
*Scorpions don't bite they "sting."
*There are more than 1500 species of scorpion worldwide
*California and Arizona have the greatest diversity of scorpions with about 60 species
Behavior
Scorpions are nocturnal and hide during the day. Some species will hide under rocks, logs and in cracks, other species will dig and hide in burrows.
Diet/Food
Scorpions are preditory. They often ambush their prey, lying in wait as they sense its approach. They consume all types of insects, spiders, centipedes and other scorpions. Larger scorpions may feed on vertebrates, such as smaller lizards, snakes, and mice if they are able to subdue them. They capture their prey with their pedipalps, paralyzing them with their venom as well if necessary. The immobilized prey is then subjected to an acid spray that dissolves the tissues, allowing the scorpion to suck up the remains.
As well as being predators, scorpions are also prey. Many types of creatures, such as centipedes, tarantulas, insectivorous lizards, birds (especially owls), and mammals, including shrews, grasshopper mice, and bats hunt scorpions for food.
Life Cycle
The pedipalps are used in scorpion courtship behavior. The male performs a kind of dance with the female, grabbing her pedipalps with his own and dragging her across the ground until he locates a preferred place to deposit his spermatophore, which is then drawn up into the female's genital pore, near the front on the underside of her abdomen. Some species' courtships include a ***ual sting of the female by the male.
Scorpion gestation periods vary from several months to a year and a half, depending on the species. Each brood will consist of about 24-35 young. They are viviparious - the young develop as embryos in the female's ovariuterus. The young scorpions are born two at at time, climbing onto their mother's back to be carried there until their first molt in about two weeks, when they will be large and strong enough to take care of themselves.
Scorpions do not metamorphasize as they grow, changing only in size and sometimes to a deeper color with each molt. Typically five or six molts over two to six years are required for the scorpion to reach maturity. The molting is accomplished by a split in the outer covering through which the scorpion must crawl in order to grow.
Scorpion lifespans range from three to five years, though some species are thought to live 10-15 years. Some kinds of scorpions show more sophisticated social behaviors, like colonial burrowing, and living in familial groups that may share burrows and food.
Scorpion Venom
Scorpion venom is used to subdue prey and to defend against threats, as well as in the mating process. The composition and action of the venom varies from species to species. The venoms are mixtures of salts, small molecules, peptides, and proteins. The peptides are specialized; some act against invertebrates and some against vertebrates, and some target both. This complex formula results in a neurotoxin which depolarizes the nervous system of the victim.
Scorpions are apparently able to regulate the delivery of the venom in scale to the size of their target. Some scorpions are known to produce a transparent prevenom in addition to the more potent opaque venom which is loaded with additional toxin. The use of the prevenom occurs at the initiation of the threat or opportunity. If the action persists, the opaque venom is released. These abilities enable the scorpion to conserve the venom for use when it is needed most, for larger predators or prey.
Ancestry
Scorpions have been found in many fossil records, including coal deposits from the Carboniferous Period and in marine Silurian deposits. They are thought to have existed in some form since about 425–450 million years ago. They are believed to have an oceanic origin, with gills and a claw like appendage that enabled them to hold onto rocky shores or seaweed.
WORD OF ADVISE
pls do a thorough research first before you decide to buy an exotic pet...
this is not easy as it looks... this is dangerous, specially the scorpions...
pls treat exotic pets with extreme respect...
this is not for everybody, this is for people with extreme patience, very responsible and has a
high regard for safety... thank you and God speed...