A new species in the monotypic genus Symbioribates, S. aokii sp. nov., is described on the basis of adult material collected from canopy habitats and wind traps in the Ryukyu Archipelago, southwestern Japan. Symbioribates aokii sp. nov. expresses different dimorphism in the octotaxic system from that of the type species, S. papuensis Aoki, 1966. The characteristics of this genus and its relationships to others of the superfamily Oripodoidea are discussed and a revised diagnosis of the family is given.
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Acari
arboreal
new species
Oribatida
Ryukyu Archipelago
sexual dimorphism
Symbioribatidae