Spirocamallanus notopteri is reddish-brown with a transversely striated cuticle. Males are smaller than females, with males being shorter and narrower. The female’s body is longer and wider, particularly around the vulvar region. The mouth opens into a barrel-shaped buccal capsule, which is wide at the base and narrows anteriorly, featuring numerous spiral thickenings. The buccal capsule is slightly larger in males than in females. Tridents are absent. The oesophagus has a muscular part and a glandular part, both longer in males than in females. Males have well-developed caudal alae and a dorso-ventrally curved tail that ends blindly. They possess two unequal spicules: the longer spicule broadens anteriorly and ends in a pointed tip, while the shorter left spicule has a hook-like curved tip. There are twelve pairs of pedunculated caudal papillae in males, with six pairs preanal, one pair adanal, and five smaller pairs postanal. In females, the vulva has two well-developed lips and is located towards the mid-body. The uterus is filled with numerous developing embryos.