Heterorhabditis spp. A) Hermaphroditic female face view. B) Vulva of hermaphroditic female showing elliptical ring around vulva. C)Amphimictic female face view. D) Male tail with peloderan bursa and ribs. E) Spicule. F) Gubernaculum, ventral view. G) Anterior region of third infective juvenile in cuticle of second-stage juvenile with tessellate pattern. H) A part of anterior region of an infective juvenile showing tessellate structure and longitudinal riges. I) Anterior end of an infective juvenile showing a prominent dorsal tooth.