Ontogenetic instars of a new species of the genus Scapheremaeus (Acari, Oribatida, Cymbaeremaeidae) from Vietnam

The genus Scapheremaeus (Oribatida, Cymbaeremaeidae) comprises 121 species having a cosmopolitan distribution. A new species—S. naiensis Ermilov sp. nov.—is described, based on adult and juvenile instars collected from branches on the Lauraceae tree in the Cat Tien National Park, southern Vietnam. The adult of the new species differs from the related species S. striatomarginatus by the number of notogastral setae, and the morphology of the anterior margin of the notogaster. The nymphal instars of the new species are characterized by the presence of exuvial scalps of the previous instars.