Tarsonemoidea

Distinguished from other prostigmatan superfamilies by the combination of reduced body segmentation, modified legs I–II with clinging adaptations, and reduced or modified legs III–IV in females. Differs from Tetranychoidea (spider mites) by lack of silk-producing structures and stigmata positioned between coxae I–II rather than between II–III. Separated from Eriophyoidea by presence of four pairs of legs in all life stages and less extreme body elongation.

Diverse microhabitats including leaf surfaces, stems, buds, and flowers of plants; fungal fruiting bodies; under bark; and as parasites or phoretic associates of insects. Many species occupy humid, sheltered microenvironments.

Cosmopolitan distribution with records from all major biogeographic regions. Individual families show varying distributions: Tarsonemidae are globally widespread, while Podapolipidae are more restricted and associated with specific host insect ranges.

Highly variable across families. Tarsonemidae includes herbivores feeding on plant cell contents, fungivores consuming fungal hyphae and spores, and predators of small arthropods or nematodes. Podapolipidae are obligate parasites of insects. Specific dietary habits for most species remain undocumented.

• plants - associated withmany Tarsonemidae feed on or inhabit plants
• fungi - associated withfungivorous species common in Tarsonemidae
• insects - parasite ofPodapolipidae are obligate parasites; some Tarsonemidae are phoretic on insects

Development includes egg, larva, and adult stages; a nymphal stage is suppressed or greatly reduced in most species. Females of many species carry eggs attached to the body. Males often develop more rapidly than females and may assist in female emergence (facilitated eclosion). Some species exhibit arrhenotoky (males produced from unfertilized eggs).

Females of many species exhibit parental care by retaining eggs on the body until hatching. Phoretic behavior is common, with mites attaching to insects for dispersal. Some agricultural pest species aggregate in protected locations such as leaf axils or under bud scales. Males of certain species assist females to emerge from the quiescent pharate stage.

Functions as herbivores, fungivores, predators, and parasites across different lineages. Some species are significant agricultural pests (e.g., broad mite, cyclamen mite). Others contribute to biological control as predators of pest mites or small insects. Parasitic forms may influence host insect population dynamics.

Several Tarsonemidae species are economically important agricultural pests, causing damage to greenhouse crops, ornamentals, and field crops through feeding on young tissues. Polyphagotarsonemus latus (broad mite) and Phytonemus pallidus (cyclamen mite) are particularly damaging. Some species are used in biological control programs. A few species are associated with stored products or honey bee colonies.

• TetranychoideaSuperficially similar small plant-associated mites, but distinguished by silk production, different stigmata position, and more pronounced body segmentation.
• EriophyoideaSimilar minute size and plant association, but Eriophyoidea have worm-like body form, only two pairs of legs in all stages, and more extreme body annulation.

• mites
• agricultural pest
• biological control
• plant-associated
• insect parasites

• BugGuide
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life