Orange-spotted emerald

It is the only species in its whole genus. It has no close sisters.

Its babies live in tree roots that hang into the river water.

It used to live in England, but it disappeared there in the last century because the rivers became dirty.

It has also vanished from the Netherlands, Germany and Luxembourg.

Crayfish brought in from other countries like the same tree roots, and in one river they may have pushed it out.