An important synapomorphy of the glandulate Oribatida (Parhyposomata, Mixonomata, Desmonomata, Brachypylina) is the presence of paired, large, exocrine oil glands in the opisthosoma. The secretions of these glands have been shown to be highly taxon-specific. In Mixo- and Desmonomata, oil gland secretions typically comprise of hydrocarbons, monoterpenes, and aromatics, and a common set of these is called “astigmatid compounds” (neral, geranial, neryl-formate, -acaridial, and a hydroxy-benzaldehyde). In this study, oil gland secretions of 9 different populations of Hermannia gibba, belonging to the cohort Desmonomata, were investigated. Adult secretions of this species were extracted and chemically analyzed via GC-MS. In total a multi-component system of collectively 41 compounds, mainly characterized by a large number of different sesquiterpenes was detected, representing a class of novel oil gland compounds for Oribatida. Thus, H. gibba shows a complete regression of the common “astigmatid compounds” and their replacement by novel mono- and sesquiterpenes such as - and pinene, limonene, -terpinene and -phellandrene. Besides terpenoid compounds, hydrocarbons like n-tridecane, pentadecane, 3-methyl-dodecane and other branched short-chain alkanes were detected, which generally are considered to represent plesiomorphic oil gland equipment. The composition of the secretion cocktail showed intra-populational stability but clearly varied between populations, possibly indicating the presence of distinct phyletic lineages within a proposed species complex “Hermannia gibba”.