Senin, 16 Desember 2013
Green Lynx Spider - (Peucetia viridans)
As its name might suggest, the Green Lynx Spider is a highly identifiable green spider of the Lynx spider grouping. Appearing an almost leaf-greenish shade, the species is further complimented by orange on the legs and black dots on a gray coloring as well. The abdomen contains chevron-looking shapes to further distinguish the species.
As with other species of spider, the female weighs in larger than the male at about 14mm to 16mm in size whereas the male comes in at just about 12mm to 14mm. Natural environments for the Green Lynx Spider includes open fields especially those exhibiting tall grassy surroundings to which the female will attach her egg sac to. Egg sacs are made of silk spun by the spider and the Green Lynx will also leave out a common "drag line" to which pull unsuspecting prey within its grasp.
Goldenrod Crab Spider - (Misumena vatia)
This species of spider uses camouflage as its primary defense, but will bite as well. They are able to change their coloration over the course of several days to blend in better with their surroundings.
They are an ambush spider, jumping on their prey. They do this instead of spinning webs.
Males are yellow with red bands or spots on their abdomen. Females are completely white or yellow, lacking bands or spots.
Feather Legged Spider - (Uloborus glomosus)
Thick legs with long, feathery hairs on them make this spider unique. They make look ferociou, but they lack venom glands.
It is a type of orb-weaver, creating fine webs that entangle prey. Typical orb-weavers recreate their web every day. A stabilimentum (zig-zag) may be visible in the web. They seem to hang, head-down, when collecting and feeding on prey.
Eastern Harvestman - (Leiobunum vittatum)
Harvestman are well camouflaged in their habitat and some species have the ability to spray a pungent scent from a gland between their first pairs of legs. Perhaps the most bewildering form of defense against a predator is self-amputation. A harvestman will remove one of its own legs (not one from the critical second pair, however) to distract a predator. The removed leg can twitch for up to an hour, allowing the harvestman time to escape. Sadly, the leg cannot grow back so it is a costly form of self-protection.
Desert Tarantula - (Aphonopelma chalcodes)
Desert Tarantulas are a common sight in the Southwestern states. They generally hide during the day, choosing instead to rest under rock collections or in protective holed burrows that are uninhabited in desert soil areas until dusk and night. As with most insect species, the male of the species is smaller though Desert Tarantulas in general are noted for their leg spans which can reach up to 4 inches on the females. Their bodies are also covered in noticeable hair. This spider will work hard at avoiding contact with people but will strike if disturbed or threatened. It should be noted that Desert Tarantula bites are considered to be poisonous and seeking medical assistance is advisable. In general, Desert Tarantula venom is reported to be about as dangerous as a bee sting but deadly allergic reactions may result.
Cross Spider - (Araneus diadematus)
The white cross marking on the abdomen of the Cross Spider became its name and main identifier. Originally from Europe, it was transported to North America and has settled in nicely given the similar climates of both continents. Unlike other non-native species, this exotic addition is not a pest. It is not harmful to humans either. It is a good worker in the garden and helps control real pests from destroying plants.
Like most members of the Orbweaver family, the Cross Spider sits in the center of its web with its head down. It may be spotted at times on the edge of its web or on a stem with its legs tucked under itself. If it feels threatened or in danger, it may first use its legs to violently shake and shimmy its web to startle the threat in hopes of causing it to leave. If that does not happen, the spider will drop to the ground and return to its web's center when it feels safe again. This spider creates a new web every day.
The Cross Spider female is almost twice the size of the male. There is evidence that some females eat the male after mating. Females lay eggs in a sac that is usually hung from the web. Their life span is only 12 months long.
This spider can be found in a variety of habitats. They are comfortable and successful in woodlands, savannas, meadows, gardens, grasslands, semi-arid regions and evergreen forests.
Cribellate Orb Weaver - (Uloborus spp.)
The legs of this spider are hairy and the foremost pair are quite long. They create webs to catch prey, but do not have sticky silk. Instead, small prey get tangled in the fine threads in such a way that stickiness is not necessary. The cribellum on the legs allow the spider to 'comb' its web, keeping the fine strands separated until prey enters.
Webs are built parallel to the ground. The spider sits on or near it in a 'tucked' position, giving it the appearance of a dead flower or piece of leaf.
Comb-Clawed Spider - (Achaearanea spp.)
Comb-clawed spiders are the most common type of house spider in North America. They come in a variety of colors and typically form webs in corners of buildings (sheds, garages, homes). They use the combs on their feet to fling strands of web at their recently snared prey, aiding in securing them.
Females hang egg sacs near their resting site and guard them until hatching.
This family of spiders includes species like the black widow, the brown widow and the American house spider.
Fans of Spiderman may recognize the body shape of these spiders being that of the one that bites Peter Parker.
California Trapdoor Spider - (Bothriocyrtum californicum)
California Trapdoor Spiders are native to Southern California. In many ways, they resemble smaller versions of tarantulas, but with shiny, hairless bodies. Their chelicerae (jaws) have spines on them, which aids this species in digging their burrows underground.
Their burrows can up more than 7 or 8 inches deep and serve as both a home and a trap. The top of the burrow opening is covered with a silk door that is hinged. As the years pass, spiders add more silk webbing to their doors. They may also collect debris and loose leaf litter, helping to camouflage its existence. Burrows are usually built into hillsides or cliff-faces, often facing direct sunlight for ambient warmth and usually near vegetation that is likely to attract insects.
Under this door, the spider waits and, when it senses oncoming prey, it quickly lunges out of its burrow and catches the prey item. Once caught, the prey is restrained in the burrow by both the spider's body as well as the silk walls inside the burrow. The prey is consumed inside the tunnel, out of sight.
As is the case with most spiders, the female California Trapdoor spider is larger than the male. Males search for females during the winter months. Females lay their fertilized eggs at the bottom of the burrow. Once spiderlings hatch, they leave the burrow, usually thanks to the prompting of a heavy spring rain.
Brown Recluse - (Loxosceles reclusa)
These spiders generally inhabit loose piles of debris outside. If indoors, they may be found lying on or inside furniture as well as within undisturbed clothing. Many bite victims put on clothing that was left on the floor and are bitten as a defense against pressure and crushing felt by the spider inside them.
This spider is not naturally aggressive and does not seek out human victims. A young family in 2001 living in Lenexa, Kansas had no issues with the arachnid during the 5 years they lived with an infestation. Scientists from the University of California helped them trap, kill and collect over 2,000 Brown Recluse spiders during a 6 month period there.
Brown Recluse venom is known to cause necrosis in human tissue. A hemotoxin present in the venom of the Brown Recluse can destroy the tissue surrounding a bite. Infection can then set in and cause even more damage to tissues and possibly spread to organs. The wound develops a crusty-like appearance and texture surrounded by patches of redness and irritation. Though this crust eventually falls off, it leaves behind a deep, crater-like shape which may not completely heal for a period of months.
The good news is that over half of the known Brown Recluse spider bites on record caused no reaction in their victims and the bites healed nicely on their own. Other victims reacted only mildly with some redness and pain that developed over a few hours. Some perceived spider bites were actually other, already-present infections (like Staph) that were misdiagnosed by the victim. An ELISA-test (scientific test that analyzes the proteins in substance) can confirm if venom belongs to a Brown Recluse, but unfortunately, this test is a lab-based test not available at doctor's offices.
Bowl and Doily Weaver Spider - (Frontinella communis)
The Bowl and Doily Weaver Spider is a member of the Sheet-Web family. The distinct shape of the web created by this species aids in identifying it. The 'bowl' shaped part of the web sits on top of a flat sheet of lacy web just as a doily (an ornate dinner mat) would. The spider sits beneath the 'bowl', but above the 'doily' while it waits for prey to get entangled. This seems to be an advantageous position as it allows it to survey its web as it gets some protection from its own predators. Once an insect is captured, the spider immobilizes it and pulls it down through the web 'bowl' for consumption. It may rebuild highly damaged parts of the 'bowl' in order to aid in ensnaring more prey.
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