European eel, Anguilla anguilla, critically endangered 1, marbled swamp eel, Synbranchus marmoratus 2, snake eel, Caecula species 3, electric eel, Electrophorus electricus 4, Mediterranean moray, Muraena helena 5, and chain moray, Echidna catenata 6. Copperplate engraving by Milton from Abraham Rees' Cyclopedia or Universal Dictionary of Arts, Sciences and Literature, Longman, Hurst, Rees, Orme and Brown, London, 1812.

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