This nematode is a migratory endoparsite that ranges from about 0.4 to 0.5 mm long and has a lip region that is angular and offset from the body. It is generally low and flat and has two distinct annules. P. brachyurus has a short strong stylet about 20 um long and large round basal knobs. It also has a short ventral overlap of the esophagus. The females have lateral fields marked by four incisures. Males are very rare and have one single outstretched testis.
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