The genus Eueremaeus includes three well defined species in central Europe (Eu. oblongus, Eu.valkanovi, Eu. silvestris) according to WEIGMANN. After a previous study of genetic analyses, thereseem to be more species at the eastern edge of the Alps. Depending on the author, three to sevenEueremaeus-species are specified for Europe. Within this study the intraspecific variability of theseanimals should be resolved through morphometric analyses. The occurrence of cryptic speciescannot be excluded. There were 161 adult individuals from nine localities, mainly from moss samples,extracted and classified morphologically. Additionally, 16 sections of measurements were gatheredon the dorsal- and ventral site of the mites. With these metric data a "Principal Component Analysis"was conducted. For comparison one species of genus Eremaeus (E. hepaticus) was included.Moreover, drawings were made of the dorsal-, ventral-, lateral- and caudal views, and also of theextremities and the pedipalp. Additionally, scanning electron micrographs were made, to verify themorphological characters.The "Principal Component Analysis" clearly separates these material into four species (Eueremaeusoblongus, Eu. valkanovi, Eu. silvestris, Eremaeus hepaticus). The morphological identification ofspecies based on differential diagnosis features coincide with the result of "Principal ComponentAnalysis". Moreover, both sexes of the three Eueremaeus-species build separate intraspecificsubgroups. The length of Costulae on Prodorsum is an important factor for the separation of species.The segregation of the sexes is based on the size of the animals. Two individuals are located outsidethe groupings and cant be assigned to any known species so far. They could belong to an entirelynew species but this has to be examined further.