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The anatomy of spiders includes many characteristics shared with other arachnids. These characteristics include bodies divided into two tagmata (sections or segments), eight jointed legs, no wings or antennae, the presence of chelicerae and pedipalps , simple eyes , and an exoskeleton , which is periodically shed .
Diagram of a spider leg and pedipalp – the pedipalp has one fewer segment. Arachnid legs differ from those of insects by the addition of two segments on either side of the tibia, the patella between the femur and the tibia, and the metatarsus (sometimes called basitarsus) between the tibia and the tarsus (sometimes called telotarsus), making a total of seven segments.
Segments of the legs of a spider. In most arachnids, hydraulic compression acts as the primary means of extension in several of their hinged leg joints, namely the femur–patella joint and tibia–metatarsus joints or second and third leg joints respectively. [3]
Pedipalps contain sensitive chemical detectors and function as taste and smell organs, supplementing those on the legs. [2] In sexually-mature male spiders, the final segment of the pedipalp, the tarsus, develops a complicated structure (sometimes called the palpal bulb or palpal organ) that is used to transfer sperm to the female seminal ...
Laterigrade: With legs directed to the side, hence appearing like and moving like a crab; [17] see prograde; Leg formula: The legs are numbered from the front from I to IV; the relative length of the legs can be represented by four numbers from the longest to the shortest; e.g. 1423 = first leg (leg I) is longest and third leg (leg III) is ...
“The hobo spider can inflict a painful bite that results in localized red swelling and some pain, but no necrotic lesion,” Potzler says. Usually, symptoms will get better within 24 hours with ...
As a result, a spider with a punctured cephalothorax cannot extend its legs, and the legs of dead spiders curl up. [13] Spiders can generate pressures up to eight times their resting level to extend their legs, [ 39 ] and jumping spiders can jump up to 50 times their own length by suddenly increasing the blood pressure in the third or fourth ...
Within hours, his leg became extremely swollen and was turning black. By the time he reached the hospital, his leg was "bursting open." Man gets bitten by flesh-eating spider on airplane, almost ...