In my graduate thesis I tried to define the differences between Triassic and Early Jurassic species of foraminiferal genus Trocholina based on absolute values and ratios and present an objective way of distinguishing between them. For this purpose, different types of statistical analysis were used, which included descriptive statistics, parametric and nonparametric Kruskal-Wallis analysis of variance and t-test. Quantitative and statistical analyzes included 329 specimens representing 17 species. Based on statistical analyzes, some species could not be distinguished from each other. The following species could not be distinguished by statistical analysis: T. acuta from T. cordevolica and T. gracilis; T. conica from T. granosa, T. laevis, T. plagiostoma, T. umbo and T. verrucosa; T. cordevolica from T. gracilis; T. gracilis from T. turris, T. granosa from T. laevis, T. umbo and T. verrucosa and T. laevis from T. verrucosa. I tried to distinguish statistically inseparable species on the basis of descriptions of type specimens. Almost all were distinguished except T. conica from T. granosa and T. plagiostoma and T. granosa from T. laevis and T. umbo, which is an indicator for possible synonymy.