Asteronotus spongicolus is a species of sea slug or dorid nudibranch, a marine gastropod mollusk in the family Discodorididae.

[2] This species was described from Zanzibar, Tanzania with additional material from the mainland coast of Tanzania and also from Lizard Island, North Queensland, Australia.

[4] Asteronotus spongicolus feeds on the leafy sponge Carteriospongia sp.

and is well camouflaged on the undersides of the sponge blades.

This Discodorididae-related article is a stub.