Hydrodessus species. 1 H. keithi, left metathoracic leg, posterior aspect 2 H. amazonensis, redrawn from Spangler (1966)A dorsal habitus B male median lobe, right lateral aspect C male right lateral lobe, right lateral aspect 3 H. nanayensis, dorsal habitus, redrawn from Spangler (1966)4 H. pereirai A dorsal aspect B lateral aspect C prosternal process, mesoventrite, mesocoxae 5 H. keithi, elytra, lateral aspect A male B female 6 H. biguttatus, right metatrochanter and metafemur, anterior aspect 7 Hydrodessus, left protibia, anterior aspect A H. phyllisae B H. tenuatus. Scale bars = 1.0 mm for 4A, B only.