Knowra Acari Acari Acari are arachnids that include mites and ticks, ranging from microscopic species to large ticks. Many live freely in soil or water, while others parasitize animals and plants.
Arachnida : Arachnida is the arthropod class that includes spiders, scorpions, mites, and ticks. Acari is one of the major lineages traditionally placed within this class.
Mite : A mite is a small arachnid belonging to the acarine lineages, distinct from ticks in common usage. Mites make up most acarine diversity and include both free-living and parasitic forms.
Lyme disease : Lyme disease is an infectious illness caused by Borrelia bacteria and transmitted to people by infected ticks. It illustrates the public-health consequences of tick feeding and pathogen transmission.
Ixodida : Ixodida is the arachnid order comprising ticks, including hard ticks and soft ticks. Ticks form a recognizable parasitic lineage within Acari, unlike the much broader mite assemblage.
Chelicerata : Chelicerata is an arthropod subphylum that includes arachnids, horseshoe crabs, and sea spiders. Acari inherits its defining chelicerae from this broader arthropod lineage.
Tick : A tick is a parasitic acarine that feeds on the blood of vertebrates. Ticks are the best-known acari adapted for prolonged attachment and blood feeding.
Scabies : Scabies is a contagious skin infestation caused by the mite Sarcoptes scabiei. This parasitic mite causes disease by burrowing and reproducing in human skin.
Trombidiformes : Trombidiformes is a diverse order of mites that includes spider mites, chiggers, and many free-living species. It demonstrates the taxonomic breadth commonly grouped under the name mites.
Chelicera : A chelicera is the first pair of appendages in chelicerates, modified for grasping, cutting, or piercing. Acari use diverse chelicerae to feed on fungi, plants, prey, or host tissues.
Haller's organ : Haller's organ is a sensory structure on the forelegs of hard ticks that detects environmental cues. It helps hard ticks locate hosts by sensing chemicals, heat, and humidity.
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