Prince Axel's wonderfish[1] (Thaumatichthys axeli) is a bottom-dwelling deep-sea anglerfish of the family Thaumatichthyidae.

As with other members of the family, they possess a distinctive forked light organ inside their mouth, which they use to lure prey.

Large, curved teeth "fringe the upper jaw like a comb".

Anton Bruun described it as "unquestionably the strangest catch of the Galathea Expedition, and altogether one of the oddest creatures in the teeming variety of the fish world."

Later, it was realized that the size difference was attributable to age, and Galatheathauma was merged with Thaumatichthys.