External morphology of the holotype of Hirudinaria thailandica sp. nov. in preserved state A dorsal and B ventral views of the whole body C dorsal views of somites XIX–XXIII D ventral views of somites X–XV E dorsal and F ventral views of somites I–VIII G dorsal and H ventral views of somites XXIV–XXVII and caudal sucker. Abbreviations: an, anus; fg, female gonopore; mg, male gonopore; np, nephridiopores; and ss, sensillae. Scale bar: 10 mm (A, B), 5 mm (C–H).