Riverside Tyrant (Knipolegus orenocensis) [XC11945]
by GABRIEL LEITE from Padre Island, near Cumaceba Lodge, Peru (song)
Riverside Tyrant (Knipolegus orenocensis) [XC118625]
by Jeremy Minns from Ilha Marchantaria, south of Manaus, Brazil (call, song)
Subspecies
Subspecies sclateri possibly a separate species, exhibits marked sexual plumage dimorphism whereas nominate and xinguensis do not. Insufficient information currently available to enable full assessment of taxonomy.
The following 3 subspecies are recognised:
orenocensis Berlepsch, 1884 - Eastern Colombia (north-eastern Meta) and central Venezuela (lower R Apure and upper R Orinoco east to Ciudad Bolívar).
sclateri Hellmayr, 1906 - North-eastern Ecuador (R Napo) through north-eastern Peru (eastern Loreto) to north-central Brazil (R Madeira east to R Tapajós). Considered by some authors to be a distinct species, Sclater's Black-tyrant (Knipolegus sclateri).
xinguensis von Berlepsch, 1912 - Eastern Brazil (lower R Xingu and R Araguaya).