All genomes
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[Q] [R] [S] [T] [U] [V] [W] [X] [Y] [Z] [ALL]
Genome names in green represent completed genomes
| Genome Name | No of Superfamily |
| Udeniomyces puniceus | 1 |
| Uleastrum palmicola | 2 |
| Uleastrum paraguense | 1 |
| Ulex europaeus | 3 |
| Ulmus alata | 2 |
| Ulmus americana | 3 |
| Ulmus parvifolia | 2 |
| Ulmus thomasii | 1 |
| Ulota crispa | 2 |
| Ulota lutea | 2 |
| Ulota obtusiuscula | 2 |
| Ulota phyllantha | 1 |
| Ulva arasakii | 3 |
| Ulva compressa | 2 |
| Ulva curvata | 2 |
| Ulva intestinalis | 5 |
| Ulva lactuca | 2 |
| Ulva pertusa | 3 |
| Ulva prolifera | 1 |
| Ulva tanneri | 2 |
| Umbellularia californica | 1 |
| Umbelopsis isabellina | 2 |
| Umbelopsis nana | 2 |
| Umbelopsis ramanniana | 4 |
| Umbilicosphaera sibogae | 2 |
| Umbonia crassicornis | 2 |
| Umbrina cirrosa | 1 |
| Umbrina cirrosa nodavirus | 3 |
| Uncaria rhynchophylla | 2 |
| Uncia uncia | 1 |
| Uncinocarpus reesii | 2 |
| Uncinula necator | 1 |
| Undaria peterseniana | 3 |
| Undaria pinnatifida | 3 |
| Ungernia flava | 2 |
| Ungnadia speciosa | 2 |
| Unixenus mjobergi | 1 |
| Upucerthia jelskii | 1 |
| Upupa epops | 1 |
| Uranomys ruddi | 2 |
| Uranotaenia sapphirina | 1 |
| Ureaplasma parvum | 1 |
| Ureaplasma urealyticum | 307 |
| Urechis caupo | 21 |
| Uroblaniulus canadensis | 2 |
| Urochloa hoja blanca virus | 1 |
| Urochloa panicoides | 4 |
| Uroleptus gallina | 2 |
| Uroleucon ambrosiae | 1 |
| Uroleucon astronomus | 1 |
| Uroleucon caligatum | 1 |
| Uroleucon erigeronensis | 1 |
| Uroleucon helianthicola | 1 |
| Uroleucon jaceicola | 1 |
| Uroleucon obscurum | 1 |
| Uroleucon rudbeckiae | 1 |
| Uroleucon rurale | 1 |
| Uroleucon solidaginis | 1 |
| Uroleucon sonchi | 1 |
| Uromastyx hardwickii | 3 |
| Uromyces viciae-fabae | 4 |
| Urophyllum ellipticum | 2 |
| Uropsilus sp. | 1 |
| Urosimulium aculeatum | 2 |
| Urotrichus talpoides | 1 |
| Ursus americanus | 1 |
| Ursus arctos | 4 |
| Ursus maritimus | 5 |
| Urtica dioica | 7 |
| Urticina crassicornis | 1 |
| Usteria guineensis | 2 |
| Ustilago hordei | 1 |
| Ustilago maydis | 62 |
| Ustilago maydis dsRNA virus | 1 |
| Ustilago maydis virus P4 | 1 |
| Ustilago maydis virus P6 | 1 |
| Ustilago sphaerogena | 2 |
| Utharomyces epallocaulus | 2 |
| Utricularia adpressa | 1 |
| Utricularia alpina | 1 |
| Utricularia biflora | 5 |
| Utricularia costata | 1 |
| Utricularia dichotoma | 1 |
| Utricularia geminiscapa | 1 |
| Utricularia juncea | 1 |
| Utricularia pubescens | 1 |
| Utriculidium durvillei | 2 |
| Uvularia floridana | 2 |
| Uvularia grandiflora | 2 |
| Uvularia perfoliata | 2 |
| Uvularia puberula | 2 |
| Uvularia sessilifolia | 3 |
