Caecothrombium deharvengi sp. nov. (Acari: Actinotrichida: Eutrombidiidae) from Vietnam, with a proposal of Caecothrombiinae subfam. nov.

Caecothrombium deharvengi sp. nov. from a cave in Vietnam is described based on adults. A new subfamily Caecothrombiinae is created in order to accommodate eyeless mites of the genus Caecothrombium André, 1945 and the genus Bruyantella Southcott, 1991 (newly synonymized with the latter). A revised diagnosis of Caecothrombium is given and a key to Caecothrombiinae is provided. Larvae and deutonymphs of the newly described species remain unknown.