Cluster dendrograms of the valve outlines of Ilyocypris species based on the matrices of ‘Fixed Outline Canberra Dissimilarity’ (FOCD, with antero-ventral and postero-ventral parts of valves placed horizontally) (A) and ‘Minimal Running Canberra Dissimilarity’ (MRCD) (B) showing overlap of the morpho-spaces between congeners. The analysed Ilyocypris species are those with living or Quaternary representatives in eastern Inner Mongolia. Pink dashed rectangles indicate groups of specimens mentioned in the text. See text for details.