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    Ascaris is a roundworm that shows distinct sexual dimorphism, with males being smaller than females. The males measure 15-30 cm and are usually 2-4 mm in diameter. They have a curved tail with pre and post anal papillae, cloaca, and a pair of spicules or penial setae. Male ascaris is monorchis, meaning it has a single testis that is a long, thin and coiled tube-like structure.