Glossodoridiformia alba O'Donoghue, 1927 Atagema quadrimaculata Collier, 1963 Petelodoris spongicola MacFarland, 1966 Atagema alba, common name the hunchback doris, is a species of sea slug or dorid nudibranch, a marine gastropod mollusk in the family Discodorididae.

[3][2] This species has been reported from Monterey Bay, California, USA south to Ensenada, Baja California, Mexico.

[4] This dorid nudibranch feeds on sponges.

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