A new-to-science moray eel has been discovered lurking in the dim river mouths of the Central Indo-Pacific, inspiring a species name that’s a hat-tip to the ruler of the underworld, Hades.

Most other moray eels live in saltwater environments like oceans and coral reefs. This new species prefers estuaries, where rivers meet the sea, creating a mix of fresh and saltwater. These areas ...

But, as scientists recently discovered, the “rare” animal turned out to be a new species. Researchers suspected some “slender” brown eels found in “mangrove swamps” across east Asia ...