Tyranniphilopterus polioptilus new species (Phthiraptera: Ischnocera: Philopteridae) parasitic on the Masked Gnatcatcher, Polioptila dumicola (Passeriformes, Polioptilidae) in Argentina

Tyranniphilopterus polioptilus sp. nov. is described and illustrated from specimens collected off Polioptila dumicoladumicola (Vieillot, 1816) from two localities in the coastal area NE of Buenos Aires Province, Argentina. Morphologically the new species is similar to T. titicacae (Eichler & Freund, 1956) and several other undescribed species from the Tyrannidae, differing from all of them by proportions of the head and dorsal anterior plate, most body measurements, number of dorsal and ventral setae in both sexes, and number and arrangements of vulvar setae in females. Descriptions of the male, female, the three nymphal instars and the egg are also included. A list is presented of all known species of Tyranniphilopterus, arranged by host taxa.