A new ascid mite from St Helena with observations on the Protogamasellus complex (Acari: Mesostigmata)

A new genus, Protogamasellopsis (family Ascidae), is proposed to accommodate the type species Protogamasellopsis corticalis sp. nov and Protogamasellus diocorus Manson. The classification of the Protogamasellus complex is discussed and a new subgenus, Protogamasellodes (type: Protogamasellus hibernicus Evans), is erected. A key is given for the separation of the genera Gamasellodes, Protogamasellus s.lat and Protogamasellopsis.