Tetrapeltalonema (t.) mystaxi sp. n. (Nematoda: Filarioidea) from Brazilian moustached marmosets, Saguinus m. mystax.

Tetrapetalonema (T.) mystaxi sp. n. is described from the subscapular connective tissues of Saguinus mystax. The parasite is placed in the subgenus Tetrapetalonema and most closely resembles Tetrapetalonema atelensis, from which it can be differentiated by its long esophagus, size and shape of the spicules, and the size and arrangement of nuclei in the tail of the microfilaria.