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- Elasmobranchs: cartilaginous fishes - sharks, rays and allies
- Electrocyte: a cell that generates electricity
- Elongate: extended, drawn out
- Emarginate: with the margin slightly hollowed
- Endemic: restricted to a particular region, for example endemic to Australia
- Entire: with a smooth margin
- Epibenthic: referring to organisms living on the bottom surface
- Epipelagic: referring to organisms living in the region between the surface and 200 m depth
- Erectile: capable of being raised or erected, often referring to spines
- Esca: the lure or "bait" on the end of the illicium of some anglerfishes and relatives
- Estuarine: living in estuaries
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