| Zygophyllum stapfii (Shinz) | | Hammock, Jen | |
| Zygophyllaceae | | Shapiro, Leo | en |
| Zostera marina L. | | Shapiro, Leo; Schulz, Katja | en |
| Zorotypus hubbardi | | Schulz, Katja | en |
| Zoochlorella | | Soulanille, Elaine | |
| Zestusa dorus | | Schulz, Katja | en |
| Zelus nugax | | Schulz, Katja | en |
| Zelus | | Schulz, Katja | en |
| Yellow Fever Virus | | Shapiro, Leo | en |
| Xiphopenaeus kroyeri (C. Heller, 1862) | | Schulz, Katja | en |
| Xestospongia muta (Schmidt 1870) | | Shapiro, Leo | en |
| Xenarthra | | Sanzenbacher, Beth | en |
| Wuchereria bancrofti (Cobbold 1877) | | Shapiro, Leo | en |
| Wohlfahrtia | | Shapiro, Leo | en |
| Winika cunninghamii | | Hammock, Jen | en |
| Welwitschia mirabilis Hook. f. | | Shapiro, Leo | en |
| Vultur gryphus Linnaeus 1758 | | Frаnkis, Michаel | en |
| Vulpes lagopus (Linnaeus, 1758) | | Shapiro, Leo | en |
| Vulpes bengalensis (Shaw, 1800) | | Campbell, Dana | en |
| Vittaforma corneae | | Shapiro, Leo | en |
| Vicugna vicugna (Molina, 1782) | | Shapiro, Leo; Schulz, Katja | en |
| Vicugna | | Shapiro, Leo; Schulz, Katja | |
| Vestimentifera | | Shapiro, Leo | |
| Vesicomyidae | | Shapiro, Leo | en |
| Vertebrates | | Shapiro, Leo | en |
| Vernonia nyassae | | Hammock, Jen | en |
| Velella velella (Linnaeus, 1758) | | Soulanille, Elaine | en |
| Vatiga manihotae | | Schulz, Katja | en |
| Varroa destructor Anderson & Trueman, 2000 | | Shapiro, Leo | en |
| Varanus bitatawa Welton, Siler, Bennett, Diesmos, Duya, Dugay, Rico, Van Weerd, & Brown, 2010 | | Schulz, Katja | |
| Vanellus leucurus (Lichtenstein, 1823) | | Frаnkis, Michаel | en |
| Urechis caupo Fisher, W.K. & G.E. MacGinitie, 1928 | | Soulanille, Elaine | |
| Uncinaria stenocephala (Railliet, 1884) | | Shapiro, Leo | en |
| Uncia uncia (Schreber, 1775) | | Frаnkis, Michаel | en |
| Ulvophyceae | | Soulanille, Elaine | |
| Ulva lactuca Linnaeus | | Soulanille, Elaine | |
| Ulva fenestrata Postels & Ruprecht | | Shapiro, Leo | en |
| Ulva | | Campbell, Dana | en |
| Ulmus glabra Huds. | | Frаnkis, Michаel | en |
| Typhochlaena seladonia | | Hammock, Jen | |
| Typhochlaena | | Hammock, Jen | |
| Tursiops truncatus (Montagu, 1821) | | Soulanille, Elaine | |
| Turdus pilaris Linnaeus 1758 | | Frаnkis, Michаel | en |
| Turdus iliacus Linnaeus 1766 | | Frаnkis, Michаel | en |
| Tunicata Lamarck, 1816 | | Soulanille, Elaine; Schulz, Katja; Shapiro, Leo | en |
| Tunga penetrans Linnaeus, 1758 | | Shapiro, Leo | en |
| Trypanosoma cruzi | | Shapiro, Leo | en |
| Trypanosoma brucei rhodesiense | | Shapiro, Leo | en |
| Trypanosoma brucei gambiense | | Shapiro, Leo | en |
| Trypanosoma brucei brucei | | Shapiro, Leo | en |
