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The arthropod leg is a form of jointed appendage of arthropods, usually used for walking.Many of the terms used for arthropod leg segments (called podomeres) are of ...
In larger variants of arachnids, such as the tarantulas and hairy desert spiders, another mechanism used for locomotion is an elastic sclerite. [6] These sclerites are semi-rigid connectors between leg segments that allow storage and expending of potential energy.
Arthropod eyes Head of a wasp with three ocelli (center), and compound eyes at the left and right. Most arthropods have sophisticated visual systems that include one or more usually both of compound eyes and pigment-cup ocelli ("little eyes"). In most cases, ocelli are only capable of detecting the direction from which light is coming, using ...
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.
Scientists discovered a 520-million-year-old fossilized larva with brains and guts intact, offering unprecedented insights into early arthropod evolution.
As in all arthropods, the chelicerate body has a very small coelom restricted to small areas round the reproductive and excretory systems. The main body cavity is a hemocoel that runs most of the length of the body and through which blood flows, driven by a tubular heart that collects blood from the rear and pumps it forward.
[83] [88] Each endopodite (walking leg) had six or seven segments, [88] homologous to other early arthropods. [90] Endopodites are attached to the coxa, which also bore a feather-like exopodite, or gill branch, which was used for respiration and, in some species, swimming. [90]
Other examples of Carboniferous arthropod gigantism included Meganeura, an eagle-sized dragonfly, and Pulmonoscorpius, a scorpion more than 3 feet (1 meter) long.