Abstract: Sausage stage: The larva of B. malayi has two caudal nuclei, a small, nail-shaped tail and a small, conical head which distinguish it from that of S. digitate.Pre-infective stage: In contrast to S. digitata, B. malayi is small in size and has a shorter esophagus. Moreover, the posterior end of B. malayi is narrow and like a leaf of willow while that of S. digitata is blunt.Infective stage: B. malayi is characterized by three big tuberant papillae at the pos-terior end while the three papillae of S. digitata are small and rod-shaped. Anal ratio is greater in B. malayi (around 4) than in S. digitata (less than 3). Esophagus/total length ratio of the former is 1/3 while that of the latter 3/4.