[1] R. kingghidorahi is a member of the “Ribbon clade” Syllinae, possessing a segmented cylindrical body that exhibits multiaxial branching that is described as "dendritic" or "tree-like".

[2] On 1 October 2019, an international team of marine biologists sampled Petrosia sponges in the sea near Shukunegi Point, at the southern tip of Sado Island.

[3] Dissection and analysis of the sponges yielded samples of the symbiont worm Ramisyllis kingghidorahi, which were preserved in an ethanol solution for further study.

The species is named after King Ghidorah, the winged, three-headed, two-tailed antagonist of Godzilla.

The King Ghidorah character was created by Tomoyuki Tanaka, inspired by Japanese mythology and folklore.