| abstract | Mites of the genus Rhizoglyphus (Acari: Acaridae) are commonly associated with the underground storage organs such as bulbs and corms of many plants. Some species can cause damage to crops and ornamental plants, both in greenhouses and in the field. They are also important in biosecurity and trade because they are frequently found in exported/imported horticultural products such as carrots, corms of taro and flower bulbs. In this revision, we examined more than 1840 Rhizoglyphus mite specimens of different stages mainly from Australasia and Oceania. Fifty nine stages of 11 species are described: R. caladii Manson (adult female, adult homeomorphic male, tritonymph, larva), R. columbianus Oudemans (adult female, adult homeomorphic male, tritonymph, protonymph, larva), R. echinopus (Fumouze & Robin) (adult female, adult homeomorphic male, tritonymph, protonymph, larva), R. howensis Manson (adult female, adult homeomorphic male, protonymph), R. minutus Manson (adult female, adult homeomorphic male, tritonymph, deutonymph, protonymph, larva), R. ogdeni sp. n. (adult female, adult homeomorphic male, tritonymph), R. ranunculi Manson (adult female, adult homeomorphic male, tritonymph), R. robini Claparède (adult female, adult homeomorphic male, adult heteromorphic male, tritonymph, deutonymph, protonymph, larva), R. setosus Manson (adult female, adult homeomorphic male, adult heteromorphic male, tritonymph, deutonymph, protonymph, larva), R. singularis Manson (adult female, adult homeomorphic male, adult heteromorphic male, tritonymph, protonymph) and R. tokelau sp. n. (adult female, adult homeomorphic male). Rhizoglyphus longispinosus Ho & Chen, 2001 is considered as a junior synonym of R. caladii Manson, 1972; R. tacitri Manson, 1972 a junior synonym of R. columbianus Oudemans, 1924; and R. tsutienensis Ho & Chen, 2000 a junior synonym of R. singularis Manson, 1972. Keys to adult females and males of Rhizoglyphus of Australasia and Oceania are provided. Lists of hosts and distributions of these species are also provided. |