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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 .
Basic characteristics of arachnids include four pairs of legs (1) and a body divided into two segments: the cephalothorax (2) and the abdomen (3). The ventral side of a brown widow spider. The epigastric plates and furrow are visible, as well as the hourglass marking on the underside of the abdomen, which is a characteristic feature of widow ...
The oldest known arachnid is the trigonotarbid Palaeotarbus jerami, from about in the Silurian period. [101] Note 3 ] Attercopus fimbriunguis , from 386 million years ago in the Devonian period, bears the earliest known silk-producing spigots, but its lack of spinnerets means it was not one of the true spiders , [ 103 ] which first appear in ...
However, in sea spider and arachnids, the pedipalps are more or less specialized for sensory [12] or prey-catching function [10] – for example scorpions have pincers [20] and male spiders have bulbous tips that act as syringes to inject sperm into the females' reproductive openings when mating.
The genus name honors the Douglass family, who donated the specimen to Chicago’s Field Museum of Natural History, and the species name references the spines that make this arachnid so distinctive.
Arachnology is the scientific study of arachnids, which comprise spiders and related invertebrates such as scorpions, pseudoscorpions, and harvestmen. Those who study spiders and other arachnids are arachnologists. More narrowly, the study of spiders alone (order Araneae) is known as araneology. [1]
However, if the sight of a spider makes you queasy, you may want to stay out of their way. Bird Watching HQ reported that the “males will crawl on anything in their way, no matter what it is, so ...
Turns out, that as temperatures drop, our houses and the heating they provide are ideal places for eight-legged arachnids to find shelter, look for mates and hunt for prey to eat. Of course ...