| Echinodermata | EUKARYA>UNIKONTA>OPISTHOKONTA>ANIMALIA>BILATERIA>DEUTEROSTOMATA>ECHINODERMATA |
| Ecdysozoa | EUKARYA>UNIKONTA>OPISTHOKONTA>ANIMALIA>METAZOA>BILATERIA>PROTOSTOMATA>ECDYSOZOA |
| Ectoprocta | EUKARYA>UNIKONTA>OPISTHOKONTA>ANIMALIA>METAZOA>BILATERIA>PROTOSTOMATA>SPIRALIA>TROCHOZOA>POLYZOA>ECTOPROCTA |
| Embryophytes | see Viridiplantae |
| Endomyxa | EUKARYA>CHROMALVEOLATA>RHIZARIAE>ENDOMYXA |
| Endosporobacteria | EUBACTERIA>FIRMICUTAE>ENDOSPOROBACTERIA |
| Entomophthoromycota | EUKARYA>OPISTHOKONTA>UNIKONTA>FUNGI>BASAL FUNGI>ENTOMOPHTHOROMYCOTA |
| Entomophthorophyceae | see Entomophthoromycota |
| Entoprocta | EUKARYA>UNIKONTA>OPISTHOKONTA>ANIMALIA>BILATERIA>PROTOSTOMATA>SPIRALIA>TROCHOZOA>POLYZOA>ENTOPROCTA |
| Eodiapsida | EUKARYA>UNIKONTA>OPISTHOKONTA>ANIMALIA>BILATERIA>DEUTEROSTOMATA>VERTEBRATA>GNATHOSTOMATA>TETRAPODA>AMNIOTA>DIAPSIDA>EODIAPSIDA |
| Eopharyngia | EUKARYA>EXCAVATA>EUEXCAVATA>EOPHARYNGIA |
| Eosynapsida | EUKARYA>UNIKONTA>OPISTHOKONTA>ANIMALIA>BILATERIA>DEUTEROSTOMATA>VERTEBRATA>GNATHOSTOMATA>TETRAPODA>AMNIOTA>SYNAPSIDA>EOSYNAPSIDA |
| Epsilonproteobacteria | EUBACTERIA>PROTEOBACTERIAE>EPSILONPROTEOBACTERIA |
| Equisetopsida | see Pteridophyta |
| Eubacteria | EUBACTERIA |
| Euexcavatae | EUKARYA>EXCAVATA>EUEXCAVATAE |
| Euglenida | EUKARYA>EXCAVATA>DISCICRISTATAE>EUGLENIDA |
| Euglenozoa | see Discicristatae |
| Eukarya | EUKARYA |
| Eurhodophytina | see Rhodophyta |
| Euryarchaeota | ARCHAEA>EURYARCHAEOTA |
| Eustigmatophyta | EUKARYA>CHROMALVEOLATA>HETEROKONTAE>EUSTIGMATOPHYTA |
| Eutrochozoa | see Spiralia |
| Excavata | EUKARYA>EXCAVATA |
