Adults are slender, thread-like and white. Females are larger than males at around 6.5cm in length. The males have a small non-lobulated bursa.
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''D. arnfieldi'' are of the superfamily [[Trichostrongyloidea]]. Adults are slender, thread-like and white. Females are larger than males at around 6.5cm in length. The males have a small non-lobulated bursa.