Xysticus silvestrii, Simon, 1905, a crab spider species in the genus Xysticus found in Argentina
Catalpa silvestrii, (Pamp. & Bonati) S.Y.Hu, a flowering plant species in the genus Catalpa
Mosfora silvestrii, Roewer, 1925, a harvestman species in the genus Mosfora and the family Epedanidae found in Funkiko
Odontomachus silvestrii, W.M. Wheeler, 1927, a carnivorous ant species in the genus Odontomachus
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Oligomyrmex silvestrii, Santschi, 1914, an ant species in the genus Oligomyrmex
Taracus silvestrii, Roewer, 1930, a harvestman species in the genus Taracus and the family Sabaconidae living in caves in the United States