T. occidentalis may refer to several different species. The specific epithet means 'western.'
Talpa occidentalis, the Spanish mole Telfairia occidentalis, a vine known as fluted gourd, fluted pumpkin, ugu, or ikong-ubong Thespesius occidentalis, a dinosaur in the genus Thespesius Thuja occidentalis, a tree known as northern white-cedar or eastern arborvitae Titanites occidentalis, an ammonite in the genus Titanites Torodora occidentalis, a moth in the family Lecithoceridae Tradescantia occidentalis, a plant called the western spiderwort or prairie spiderwort Triantha occidentalis, a carnivorous plant Trichromia occidentalis, a moth in the family Erebidae Trimeresurus occidentalis, a synonym for Craspedocephalus gramineus, the bamboo pit viper Triodopsis occidentalis, the western three-toothed land snail Turpinia occidentalis, a tree known as muttonwood
See also Taenaris cyclops occidentalis, a subspecies of the butterfly Taenaris cyclops Thymelicus sylvatica occidentalis, a subspecies of the moth Thymelicus sylvatica Tilia caroliniana subsp. occidentalis, a subspecies of the tree Tilia caroliniana