Acanthodoris rhodoceras is a species of sea slug, a dorid nudibranch, a shell-less marine gastropod mollusc in the family Onchidorididae.

[2] This species was described from Dead Man's Island, San Pedro, California.

It has been reported from Umpqua River, Oregon south to Bahía de los Ángeles, Gulf of California, Mexico.

[3][4] Specimens from Pillar Point, San Mateo County; Ellwood Boulder Field, Santa Barbara County and Hazard Canyon, San Luis Obispo County have been sequenced for the 16S ribosomal RNA, Histone H3 and CO1 genes.

[5][6]