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

The arachnids (class Arachnida) are an arthropod group that includes spiders, daddy longlegs, scorpions, mites, and ticks as well as lesser-known subgroups. Extremely small arachnid, parasite of animals and occasionally humans; it can transmit infectious diseases.

In most arachnids, the retina probably does not have enough light sensitive cells to allow the eyes to form a proper image.[14].

By signing up for this email, you are agreeing to news, offers, and information from Encyclopaedia Britannica. Arachnids produce digestive juices in their stomachs, and use their pedipalps and chelicerae to pour them over their dead prey. Arachnids are mostly carnivorous, feeding on the pre-digested bodies of insects and other small animals.

Arachnid, (class Arachnida), any member of the arthropod group that includes spider s, daddy longlegs, scorpion s, and (in the subclass Acari) the mite s and tick s, as well as lesser-known subgroups. Almost all extant arachnids are terrestrial, living mainly on land. They are now usually treated as two separate taxa – Acariformes, mites, and Parasitiformes, ticks – which may be ranked as orders or superorders. [22], Chelicerata (sea spiders, horseshoe crabs and arachnids), Myriapoda (centipedes, millipedes, and allies), The extant chelicerates comprise two marine groups: sea spiders and horseshoe crabs, and the terrestrial arachnids. The heart is located in the forward part of the abdomen, and may or may not be segmented. Spiders are the largest order in the class, which also includes scorpions, ticks, mites, harvestmen, and solifuges. Somewhat unexpectedly, there was support for a clade comprising Opiliones, Ricinulei and Solifugae, a combination not found in most other studies.
Aquatic arachnid found in Eurasia; to live in the water, it weaves a kind of bell that it fills with air and carries along on the hairs of its abdomen. [9] Scorpions, pseudoscorpions and some harvestmen have evolved muscles that extend two leg joints (the femur-patella and patella-tibia joints) at once. In North America alone, there are about 8,000 arachnid species. The most important to most arachnids are the fine sensory hairs that cover the body and give the animal its sense of touch. Further adaptations to terrestrial life are appendages modified for more efficient locomotion on land, internal fertilisation, special sensory organs, and water conservation enhanced by efficient excretory structures as well as a waxy layer covering the cuticle.

Arachnida (/əˈræknɪdə/) is a class of joint-legged invertebrate animals (arthropods), in the subphylum Chelicerata. However, mites are variable: as well as eight, there are adult mites with six or even four legs.

[4], Arachnids are further distinguished from insects by the fact they do not have antennae or wings.
[16], Arachnids usually lay yolky eggs, which hatch into immatures that resemble adults. Finally, slit sense organs are slit-like pits covered with a thin membrane. Pseudoscorpiones may also belong here, possibly as the sister of Scorpiones. [19] Including fossil taxa does not fundamentally alter this view, although it introduces some additional basal groups.

The next pair of appendages, the pedipalps, have been adapted for feeding, locomotion, and/or reproductive functions. (However, there is currently neither fossil nor embryological evidence that arachnids ever had a separate thorax-like division, so the validity of the term cephalothorax, which means a fused cephalon, or head, and thorax, has been questioned.


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