The word "hidden" was adopted for the name because the fish has blended in among other species of sunfish for a long time and has only been discovered recently.

[3] It was first described by Marianne Nyegaard, a marine scientist who studied ocean sunfish for her PhD.

It has a smooth body shape, no bump and has a maximum length of 242 cm (about 7.9 feet).

[6] It is thought to live primarily in the Southern Hemisphere and has been found in waters off New Zealand, Australia, South Africa, and Chile.

[1] Their diet is known to consist of salps and nektonic siphonophores because these two organisms are found in the digestive tract of Mola tecta.