Figure 6From: Unsuspected diversity of Niphargus amphipods in the chemoautotrophic cave ecosystem of Frasassi, central ItalyPrincipal components analysis of seven quantitative morphological characters measured on 27 Niphargus individuals from Frasassi. Insert shows the loadings of each individual character on the two principal components (green diamonds: Clade 1; blue triangles: Clade 2; red crosses: Clade 3)Back to article page