Abstract
Dirofilaria lutrae is described from the subcutaneous tissues of the American otter in Louisiana and Florida. The species is characterized by long and slender form, absence of longitudinal cuticular ridges (except on the tail of the male), extremely large left and relatively short right spicules, and an unusually large, unsheathed microfilaria. Morphologically, the species is most similar to Dirofilaria incrassata which parasitizes certain Central and South American sloths.

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