Description of a Sexually Dimorphic Oribatid Mite (Arachnida: Acari: Oribatida) from Canopy Habitats of the Ryukyu Archipelago, Southwestern Japan

Abstract 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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