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

E. steineri sp. n., SEM, male paratype from Cave Tham Deu. A head (H) and left antenna, frontal view B segments 2 and 3, lateral view C. segments 4 and 5, lateral view (m2–m5 = metaterga 2–5) D collum (Co), dorsal view E segments 6 and 7, lateral view (m6–m7 = metaterga 6, 7) F telson, subventral view G cross-section of segment 11, caudal view H segments 8–10, dorsal view I segments 17–19 and telson, lateral view (m8–m10, m17–m19 = metaterga 8–10, 17–19).