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Arachnids are a class Arachnida of joint-legged invertebrate animals arthropodsin the subphylum Chelicerata. All arachnids have eight legsalthough the front pair of legs in some species has converted to a sensory function, while in other species, different appendages can grow large enough to take on the appearance of extra pairs of legs. Almost all extant arachnids are terrestrialliving mainly on land.

However, some inhabit freshwater environments and, with the exception of the pelagic zonemarine environments as well. They comprise overnamed speciesincluding spidersscorpionsharvestmenticksmitesand solifuges. However, arachnids also have two further pairs of appendages that have jumb adapted for feeding, defense, and sensory perception. The first pair, the cheliceraeserve in feeding and defense. In Solifugaethe palps are quite leg-like, so that these animals appear to have ten legs.

The larvae of mites and Ricinulei have only six legs; a fourth pair usually appears when they moult into nymphs. However, mites are variable: as well as eight, there are adult mites with six or even four legs. Their body is organized into two tagmatacalled the prosomaor cephalothoraxand the opisthosomaor abdomen. The cephalothorax is derived from the fusion of the cephalon spraay and the thoraxand is usually covered by a single, unsegmented carapace.

The abdomen is segmented in the more primitive forms, but varying degrees of fusion between the segments occur in many groups. It is typically divided into a preabdomen and postabdomen, although this is only clearly visible in scorpions, and in some orders, such as the Acarithe abdominal sections are completely fused. The endosternite is even calcified in some Opiliones. Spiders and whipscorpions msn their limbs hydraulically using the pressure of their hemolymph. This type of tracheal system has almost certainly evolved from the book lungs, and indicates that the tracheae of arachnids are not homologous with those of penos.

The excretory glands of arachnids include up to four pairs of coxal glands along the side of the prosoma, and one or two pairs of Malpighian tubulesemptying into the gut. Many arachnids have only one or the other type of excretory gland, although several do have both. The primary nitrogenous waste product in arachnids is guanine. Arachnids with an efficient tracheal system do not need to transport oxygen in the blood, and may have a reduced circulatory system.

In scorpions and some spiders, however, the blood contains haemocyanina copper-based pigment with a similar function to haemoglobin in vertebrates. The heart is located in the is there a spray to numb the penis so as to make a man last part of the abdomen, and may or may not be segmented. Some mites have no heart at all. Only in the harvestmen and among mitessuch iis the house dust miteis there ingestion of solid food particles, and thus exposure to internal parasites, [13] although it is not unusual for spiders to eat their own silk.

Several groups secrete venom from specialized glands to kill prey or enemies.

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