Pogonomyrmex occidentalis was created in 1865.
Pogonomyrmex californicus was created in 1968.
Pogonomyrmex rugosus was created in 1895.
Pogonomyrmex maricopa was created in 1914.
Carex occidentalis was created in 1889.
Emblemariopsis occidentalis was created in 1970.
Starksia occidentalis was created in 1979.
Ucides occidentalis was created in 1897.
Elachista occidentalis was created in 1882.
Linderiella occidentalis was created in 1923.
Androsace occidentalis was created in 1813.
Gymnoclytia occidentalis was created in 1908.
Toxomerus occidentalis was created in 1922.