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This study is based on oribatid mites of the subfamily Arcoppiinae (Oribatida, Oppiidae) collected from rainforest litter in Izabal Department, Guatemala. A new species of Arcoppia—A. tetraramosa sp. nov.—is described. In having several long, barbed branches of the bothridial seta and comparatively long dorsal notogastral setae, the new species is similar to A. dechambrierorum and A. serrulata, but can be distinguished from both by the morphology of the rostrum, the length of dorsal notogastral setae, the sculpturing of basal part of the prodorsum, the length of the costula, and the presence of the specific ridge-like structure in front of the transcostula. A supplementary description of Wallworkoppia cervifer is presented and its main morphological traits are summarized.
Sergey G. Ermilov (Thu,) studied this question.