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Diversity [1] 132 families, c. 50,000 species. Spiders ( order Araneae) are air-breathing arthropods that have eight limbs, chelicerae with fangs generally able to inject venom, [2] and spinnerets that extrude silk. [3] They are the largest order of arachnids and rank seventh in total species diversity among all orders of organisms.
- Argiope Aurantia
Argiope aurantia is a species of spider, commonly known as...
- Spider (película)
Spider es un thriller psicológico dirigido por el canadiense...
- Argiope Aurantia
Spider-Man, traducido en ocasiones como el Hombre Araña, 11 12 es un personaje creado por los estadounidenses Stan Lee y Steve Ditko, 13 14 e introducido en el cómic Amazing Fantasy n.° 15, publicado por Marvel Comics en agosto de 1962. 15 Se trata de un superhéroe que emplea sus habilidades sobrehumanas, reminiscentes de una araña, pa...
spider, (order Araneida or Araneae), any of more than 46,700 species of arachnids that differ from insects in having eight legs rather than six and in having the body divided into two parts rather than three. The use of silk is highly developed among spiders.
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Spiders have a two-part body, the front part (cephalothorax) and the abdomen. Unlike insects, spiders do not have antennae. The more advanced spiders have a centralized nervous system, with their ganglia fused into one mass in the cephalothorax. Unlike most arthropods, spiders have no extensor muscles in their limbs, and extend them by hydraulicpre...
What most spiders eat
Spiders are predators, and eat insects and other arthropods (including other spiders). Most use venomfrom their fangs to kill their prey. It is rare for spiders to capture prey that are much larger than they are. It is also difficult for most spiders to capture prey that are very much smaller than they are. There are some spiders that form colonies. Spiders eat not only spiders of other species, but spiders of their own species. The black widowspider got its name because the females sometimes...
Some spiders are not predators
Spiders are basically predators, but some have other food sources. The jumping spider Bagheera kiplingi gets over 90% of its food from fairly solid plant material produced by acacias as part of a beneficial relationship with a species of ant. Young spiders of several families feed on plant nectar. Studies have shown that they do this for long periods. They also clean themselves regularly while feeding. These spiders also prefer sugar solutions to plain water, which shows that they are looking...
Capturing insects without using webs
Not all spiders use silk to net their prey. Instead, these spiders may capture insects by grabbing them and then biting them. Among these kinds of spiders the two best known are the wolf spiders and the jumping spiders.
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). Instead, they spin small sperm webs on to which th...
Of the 40,000 spiders, less than 12 are known to be dangerous to humans. Most of the time, being bitten by a spider is painful. Most spiders use venom to paralyse their prey; they kill it through eating, or through a bite. A few spiders have venoms that can be dangerous to weakened people and those allergic to it. Since 1927, 13 people have died, a...
Click on a picture to see it larger: 1. Small: Platycryptus undatus 8–13 mm 2. Medium: Argiope aurantia 14–25 mm 3. Large: Theraphosa blondi 120–140 mm 4. Phoneutria nigriventer Brazilianwandering spider
Platnick N.I. 20013. The world spider catalog. Hosted by the American Museum of Natural History, and edited by Peter Merrett and H. Don Cameron.
The evolution of spiders has been ongoing for at least 380 million years. The group's origins lie within an arachnid sub-group defined by the presence of book lungs (the tetrapulmonates); [1] [2] the arachnids as a whole evolved from aquatic chelicerate ancestors.
