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Arachnids are arthropods in the class Arachnida (/ ə ˈ r æ k n ɪ d ə /) of the subphylum Chelicerata. Arachnida includes, among others, spiders, scorpions, ticks, mites, pseudoscorpions, harvestmen, camel spiders, whip spiders and vinegaroons. [2] Adult arachnids have eight legs attached to the cephalothorax.
Now, however, it appears that non-orb spiders are a subgroup that evolved from orb-web spiders, and non-orb spiders have over 40% more species and are four times as abundant as orb-web spiders. Their greater success may be because sphecid wasps , which are often the dominant predators of spiders, much prefer to attack spiders that have flat webs.
As in other arachnids, the nervous system is highly concentrated in the cephalothorax, but has a long ventral nerve cord with segmented ganglia which may be a primitive trait. [49] The pedipalp is a segmented, clawed appendage used for prey immobilization, defense and sensory purposes. The segments of the pedipalp (from closest to the body ...
Common spiders. American House Spiders or "common house spiders" are the most common of these pesky arachnids that you will encounter. They are generally considered a nuisance, and most people do ...
The UGA researchers discovered that the Jorō spiders' ability to remain so calm under stress, with the arachnids even staying still for hours, stems from a rare freezing response previously ...
Heath Ledger refused to present the Oscars in 2007 after he and Jake Gyllenhaal were asked to make fun of their "Brokeback Mountain" characters' romance. Image credits: 9oRo #2
Spiders have been used in studies which indicate that invertebrates may experience pain. Under natural conditions, orb-weaving spiders (Argiope spp.) undergo autotomy (self-amputation) if they are stung in a leg by wasps or bees. Under experimental conditions, when spiders were injected in the leg with bee or wasp venom, they shed this appendage.
As absurd as it can sound on paper, the truth is that facts are just fun, the more obscure, weird and random, the better. After all, everyone needs a handful of interesting trivia to pull out at ...