Myrtartona leucopleura is a species of moth in the Zygaenidae family. It is found in Queensland, New South Wales and the Australian Capital Territory. The length of the forewings is 8–8.5 millimetres (0.31–0.33 in) for males. The head, thorax and abdomen ground colour are dark brownish. The upperside of the forewings is dark grey-brown. The underside is slightly paler. The hindwing upperside is blackish grey, but paler proximally. The underside is similar but slightly paler. Females are similar to males but have narrower and more rounded wings. It is the only Australian Zygaenidae species with a bright white lateral line along the abdomen.