Four new species of the millipede genus Eutrichodesmus Silvestri, 1910 from Laos, including two with reduced ozopores (Diplopoda, Polydesmida, Haplodesmidae)

E. parvus sp. n., SEM, male paratype from Cave Tham Nam Long. A head (H), frontal view B segments 3–6, subdorsal view C telson, subventral view D spinneret (sp), detail E collum (Co) and segment 2 (m2 = metatergum 2), dorsal view F segments 7–9, lateral view (m7–m9 = metaterga 7–9) G prozonum 2, dorsal view H segments 10–11, dorsal view I segments 13–15, dorsal view J segments 17–19 and telson, lateral view (m10–11, 13–15, 17–19 = metaterga 10, 11, 13–15, 17–19).