Adults are long, white, thread-like worms. Males measure 12 to 16 cm long with the tail spirally coiled. It bears narrow alae and three pairs of large caudal papillae, one of which is postanal and three pairs of small ones near the tip of the tail. The left spicule is 324 to 375 um long and the right 90 to 229 um. Females are 25 to 30 cm long with the vulva opening just behind the posterior end of the esophagus. Microfilariae are sheathless, 218 to 329 um long, and have a long pointed tail.