Anystinae

Distinguished from other Anystidae subfamilies by the combination of: long, slender legs enabling characteristic rapid whirling movement; generally larger body size compared to related prostigmatic mites; and the presence of two pairs of eyes (when visible). The genus *Anystis* can be recognized by its bright coloration and extremely fast, circular running patterns. Separation from *Erythracarinae* requires examination of leg chaetotaxy and palpal structure.

Small to medium-sized mites, generally 1-2 mm in length. Body typically oval to elongate-oval in shape. Legs are long and slender relative to body size, adapted for rapid running. Coloration often bright red, orange, or yellow, though some species are brown or greenish. Chelicerae are prominent and stylet-like, adapted for predation. Setae are usually sparse to moderate in density.

Predominantly terrestrial habitats including soil surface, leaf litter, grasses, and low vegetation. Often found in agricultural fields, orchards, gardens, and disturbed open habitats. Some species occur on woody plants and shrubs. Generally favors warm, sunny conditions with exposed surfaces suitable for rapid movement.

Worldwide distribution with records from all continents except Antarctica. Particularly well-represented in temperate and subtropical regions. The genus *Anystis* has been introduced to multiple regions for biological control purposes.

Active primarily during warmer months; peak activity in spring and summer in temperate regions. Some species may be active year-round in tropical and subtropical climates. Overwintering stages may occur in soil or protected microhabitats.

Predatory, feeding on small arthropods and arthropod eggs. Documented prey includes spider mites (Tetranychidae), thrips, aphids, small insect larvae, and other mites. Some species may supplement diet with pollen or fungal spores, though predation is the primary feeding mode.

Development includes egg, larva, protonymph, deutonymph, tritonymph, and adult stages. All active stages are predatory. No hypopal (phoretic) stage occurs. Generation time varies with temperature, ranging from several weeks to months. Females deposit eggs in soil or on vegetation.

Characterized by extremely rapid, erratic running movements in circular or zigzag patterns—hence the common name 'whirligig mites.' This movement pattern is thought to aid in prey detection and predator avoidance. Non-web-building; active hunters that pursue or ambush prey. Often seen running quickly across exposed soil surfaces, leaves, or other substrates in warm conditions.

Important generalist predators in agricultural and natural ecosystems. Contribute to biological control of pest mites and small insects. Serve as prey for larger arthropods and small vertebrates. Influence population dynamics of phytophagous mites in cropping systems.

Several species, particularly in the genus *Anystis*, are commercially produced and sold for biological pest control in agriculture and horticulture. Used for management of spider mites, thrips, and other small pests in greenhouse and field crops. Non-venomous and harmless to humans; does not bite or transmit disease.

• ErythracarinaeAlso in family Anystidae; distinguished by different leg chaetotaxy and generally less rapid movement. Erythracarines often have more setose bodies and different palpal structures.
• Bdellidae (snout mites)Similar predatory mites with rapid movement; distinguished by elongated snout-like rostrum and different cheliceral structure. Bdellids also have a characteristic jerky movement pattern distinct from the whirling gait of Anystinae.
• CunaxidaeFast-running predatory mites sometimes confused with anystines; distinguished by presence of a palpal thumb-claw complex and different body proportions.

• predatory mites
• biological control
• whirligig mites
• terrestrial predators
• agricultural beneficials

• BugGuide
• iNaturalist taxon
• NCBI Taxonomy