A glimpse in the dark? A first phylogenetic approach in a widespread freshwater snail from tropical Asia and northern Australia (Cerithioidea, Thiaridae)

Results of the analysis of biometric data of “Thiara” aspera (Lesson, 1831) specimens from Australia (yellow), Indonesia (green), Thailand (red) and India/Sri Lanka (blue) and type material of Melania aspera Lesson, 1831 (holotype, triangle), Melania rudis Lea & Lea, 1851 (syntype, square) and Melania microstoma Lea & Lea, 1851 (syntype, diamond). A. Scatter plot of the first two axes of the principal component analysis (PCA) of biometric data. Coloured lines indicate the outline of the convex hull for each geographic group; B, C. Boxplots of PCA 1 (B) and PCA 2 (C); bars above the box plots indicate significant differences of groups resulting from testing with Dunn’s test.