acarid
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What are arachnids?
Arachnids (class Arachnida) are a group of arthropods recognized by their division of the body into two parts, the cephalothorax and the abdomen, and by their six pairs of appendages. The term arachnid refers to a class of animals that includes spiders, scorpions, mites, and ticks. They have a hard external skeleton and range in size from the mite, which is 0.003-in (0.08-mm) long, to the 8-in (21-cm) black scorpion of Africa. Most arachnids are carnivorous, but most are unable to digest food internally; instead, they inject their prey with digestive fluids, then suck the liquefied remains. Arachnids are found worldwide in nearly every habitat.
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What is an acarid?
An acarid refers to any member of the subclass Acari, Acarina, or Acarida, a subgroup within the arthropod class Arachnida. This subclass includes both mites and ticks. Acarids are characterized by a lack of visible body segmentation.
They show a high degree of specialization and morphological diversity, and can be separated into the superorders Parasitiformes and Acariformes. Acarids inhabit diverse environments including plants, soil, animals, stored foods, and fresh and marine water. Many are parasitic and can transmit diseases, making them economically significant.
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How are acarids different from other arachnids like spiders and scorpions?
Acarids, belonging to the subclass Acari, are a subgroup of arachnids that includes mites and ticks. While sharing characteristics with other arachnids like spiders and scorpions, acarids possess unique features. Unlike most arachnids, acarids generally lack visible body segmentation.
Key differences:
* Body Structure Most arachnids have two distinct body regions (cephalothorax and abdomen), while acarids typically lack this segmentation.
* Appendages Acarids have specialized feeding appendages (chelicerae) and sensory structures (palps) located in an anterior region called the gnathosoma.
* Diversity Evolution has led to specialization and morphological diversity in mites and ticks that is unmatched by any other group of arachnids.
* Habitat With the exception of a few groups that have become aquatic, arachnids are terrestrial predators.
* Size Arachnids range in size from tiny mites that measure 0.08 mm (0.003 inch) to the enormous scorpion Hadogenes troglodytes of Africa, which may be 21 cm (8 inches) or more in length.3 Britannica SourcesCreated from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles. -
Where do acarids usually live?
Acarids, also known as mites and ticks, are members of the subclass Acari within the arthropod class Arachnida. They occupy diverse habitats worldwide, including fresh and marine water, soil, plants, stored foods, and as parasites on animals, including humans.
Free-living acarids can be found in soil, preying on small arthropods, or feeding on fungi in the surface layers of the soil. Some species have specialized mouthparts to pierce plant cells, while others infest stored grain and cereal products. Parasitic acarids live on the skin surface or burrow into the skin, hair follicles, or quills of their hosts. Some reside in the nasal passages, lungs, or deeper body tissues of animals. Examples include dust mites in house dust and ticks in fields and woods.
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What roles do acarids play in nature and the environment?
Acarids, a subgroup of arachnids that includes mites and ticks, play varied roles in nature and the environment. Beetle mites (Oribatida) are largely fungal feeders and are extremely numerous in the surface layers of soil, contributing to soil fertility. Some mites consume plant cells, causing gall formation or acting as foliage feeders, while others, like those in the families Acaridae and Glycyphagidae, feed on stored grains.
Many acarids are free-living predators, preying on small arthropods and invertebrates in soil, humus, or water. They also use insects for dispersal in a nonparasitic association known as phoresy.
Parasitic acarids, found in all groups except Opilioacariformes, Holothyrina, and Oribatida, can be external or internal parasites of animals. Some live on the skin or feathers of hosts, while others burrow into the skin, hair follicles, or quills, feeding on secretions or blood. Ticks, in particular, are known to transmit diseases to humans and animals.
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How can some kinds of acarids affect humans, animals, or plants?
Acarids, a subgroup of arachnids that includes mites and ticks, impact humans, animals, and plants in various ways.
- Humans and Animals Some acarids transmit diseases, cause allergic reactions, or are parasites. For example, house-dust mites (Dermatophagoides) cause allergies, and mange, itch, and scab mites (Astigmata) can cause skin issues. Ticks surpass all arthropods, except mosquitoes, in the number of diseases they transmit. Lyme disease and Rocky Mountain spotted fever are examples of diseases transmitted to humans by ticks.
- Plants Eriophyid and tetranychid mites injure or kill plants and transmit plant viruses. Some free-living mites pierce plant cells and suck out their contents, causing gall formation or malformation of fruits and leaves.
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acarid, (subclass Acari or Acarida or Acarina), any member of the subgroup of the arthropod class Arachnida that includes the mites and ticks.
General features
Size range and diversity of structure
Some mites are as small as 0.1 mm (0.0039 inch) in length, while the largest ticks are slightly more than 30 mm (1.18 inches) long. Nymphs and adults generally have four pairs of legs, although newly hatched larvae have only three pairs. Members of some families have a dense covering of stiff hairs, or setae, while others are almost nude. Soft-bodied mites and ticks have only a few hardened plates, or shields, but others are strongly sclerotized with numerous hardened plates covering the body. Acarids range in shape from minute, soft-bodied, elongated or circular individuals to large, hard-bodied, spiderlike ones. Some are flattened, but others assume grotesque body shapes as they become engorged with food or filled with eggs.
Distribution and abundance
Mites and ticks are distributed throughout the world in almost every conceivable habitat and frequently occur in large numbers. They are recorded as high as 5,000 metres on the slopes of Mount Everest and as deep as 5,200 metres in the northern Pacific Ocean. More than 50 terrestrial species are known from the Antarctic. A few mites have been found drifting at high altitudes as atmospheric plankton.
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Acarids have been found in diverse habitats that include hot springs, caves, harsh deserts, and tundras. Although many of the approximately 50,000 species described are free-living, some are parasites of animals. Some taxonomists have estimated that, if all species were known, the total number of species of mites and ticks would be more than 500,000.
Importance
The Acari are an economically important arachnid group. Ticks (order Ixodida) surpass all other arthropods, except mosquitoes, in the number of diseases they transmit to humans. Many mites also are intermediate hosts of diseases transmissible to humans, domesticated animals, and crops. Others are pests as a result of their biting or feeding habits or the damage they cause to food and related products.
Eriophyid and tetranychid mites (suborder Prostigmata) include many plant-feeding species that frequently seriously injure or kill the host plant. Eriophyids are the only phytophagous acarids known to transmit plant viruses.
In the mite order Holothyrida (superorder Parasitiformes), one species of Holothyrus is known to secrete an irritant substance that is toxic to fowl and humans. The house-mouse mite (Liponyssoides sanguineus) transmits rickettsialpox to humans. Widespread species such as the tropical fowl mite (Ornithonyssus bursa), northern fowl mite (O. sylviarum), and chicken mite (Dermanyssus gallinae) also are pests of poultry and humans.
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The mange, itch, or scab mites (Astigmata) occur on many different animals including humans. House-dust allergy is caused by species of Dermatophagoides, an extremely common mite.
The beetle mites (Oribatida) are among the most numerous soil arthropods. These mites are important in the development of soil fertility. Some also act as intermediate hosts for important tapeworm parasites of domestic animals.
Lyme disease of humans and some animals is caused by a spirochete transmitted by Ixodes dammini or other related species. Rocky Mountain spotted fever, a rickettsial disease that occurs in the United States, is transmitted to humans by the bite of several species of hard ticks (Ixodidae), especially the Rocky Mountain wood tick (Dermacentor andersoni) and the American dog tick (D. variabilis). Relapsing fever, an important bacterial disease throughout the world, is transmitted to humans by certain species of soft ticks (Argasidae) of the genus Ornithodoros. Texas cattle fever is a widespread protozoan disease transmitted by cattle ticks (Boophilus). This disease, no longer prevalent in the United States because the tick has been eliminated, remains important in many tropical and subtropical countries. Various other diseases transmitted to animals by ticks include anaplasmosis, tularemia, Q fever, Colorado tick fever, hemorrhagic fever, and tick-borne encephalitis.
The chiggers (Prostigmata), important pests of humans, also transmit scrub typhus (tsutsugamushi disease), a rickettsial disease occurring in the Asia-Pacific region.
Natural history
Reproduction and life cycle
The sexes occur separately in acarids; i.e., there are both males and females. Most species lay eggs (oviparity), but in some parasitic ones the eggs hatch within the female, and the young are born alive. Many species also can reproduce by parthenogenesis, i.e., by development of unfertilized eggs.
Sperm may be transferred either directly or in packets called spermatophores. The male spermatozoa may be introduced by the male copulatory structure (aedeagus) directly into the female genital opening or, as in some Astigmata, into a special female copulatory structure called a bursa copulatrix. The males of species that use the latter method may have special copulatory structures (e.g., suckers, spurs, or enlarged legs) for grasping the female. Some males produce a sealed packet containing spermatozoa (spermatophore) that is transferred to the female genital opening, either directly by the mouthparts of the male or indirectly by deposition on a surface, after which the female places it in her genital opening. Eggs begin to develop after fertilization. Although only a few eggs develop simultaneously in many acarids, large numbers develop at the same time in ticks and some mites. Eggs are deposited haphazardly on food material by many plant- and grain-feeding species and are hidden in the soil by predatory soil-inhabiting species. In one predatory mite, Cheyletus eruditus, females brood a small cluster of eggs and will drive other arthropods from them.
The primitive life cycle among species that lay eggs has four active immature stages: hexapod larva, protonymph, deutonymph, and tritonymph. There are many deviations from this primitive type of life cycle, which is found only in the Oribatida and some Prostigmata. The hexapod larva, characterized by three pairs of legs, is common to all families of acarids except Eriophyidae (Prostigmata), whose members have only two pairs of legs in all active stages. Among the Parasitiformes the Mesostigmata lack the tritonymphal stage. The Ixodidae may have only one nymphal stage, while the Argasidae may have as many as eight. Some Prostigmata (Podapolipidae) develop directly from egg to larviform adults, while others have from one to three nymphal stages. Many Astigmata (superorder Acariformes) have a nonfeeding (hypopal) stage between the protonymphal and tritonymphal stages, which frequently occurs during adverse environmental conditions.