In order to assess the relationship between the oppiid mite species (Acari, Oribatida) collected from Turkey, traditional and geometric morphometric methods were used. We have taken photographs of 128 specimens belonging to 11 species from six subfamilies of Oppiidae. These photographs were digitized and 17 interval measurements were taken for traditional morphometric analysis, and 20 landmarks were recognized on the ventral surface of each specimen for geometric morphometric analysis. The effectiveness to separate taxa was compared between the two morphometric analyses. In both dendrograms Oppia nitens formed a single cluster, Oxyoppia ilicaensis was singled out from the remaining nine species, which were clustered together. Two species, Lauroppia fallax and Rhinoppia obsoleta, clustered together implying a very close relationship.
In the current research, two species, Amerus polonicus Kulczynski, 1902 and Zetorchestes grandjeani Krisper, 1987 were obtained from the province of Sakarya and given some morphological descriptions. The two species are recorded for the first time from Turkey where the family Ameridae to which the former species belongs is also the first record and the latter species is the second record as the species of Zetorchestes.
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