Appearance
The body of Polycera atra is translucent white with longitudinal black lines interspersed with rows of raised yellow spots. The oral veil has 4-8 tapering yellow-tipped papillae.

Polycera atra, MacFarland, 1905
Polycera atra, common name orange-spike polycera or sorcerer's sea slug, is a species of sea slug, a nudibranch, a marine gastropod mollusk in the family Polyceridae.
The body of Polycera atra is translucent white with longitudinal black lines interspersed with rows of raised yellow spots. The oral veil has 4-8 tapering yellow-tipped papillae.
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