Ceratosoma pustulosum is a species of sea slug or dorid nudibranch, a marine gastropod mollusk in the family Chromodorididae.

[2] This species was described from Timor.

[3] The type specimen of Ceratosoma pustulosum is in Muséum Nationale d'Histoire Naturelle, Paris and was studied by Pruvot-Fol.

[4] It is similar to Ceratosoma brevicaudatum but is unlikely to be the same species as this is a warm temperate species.

It is currently not identifiable with any records since 1804.