Felimare bayeri is a species of colorful sea slug or dorid nudibranch, a marine gastropod mollusk in the family Chromodorididae.

[3] However, in 2012 a thorough re-evaluation of the genera in the family Chromodorididae based on molecular data, DNA sequences, revealed several distinct clades and Felimare was resurrected for one of these.

[8] The original description of the colour pattern reads "The color alive (based on a photograph) is: notum blue with 6-10 longitudinal anastomosing orange yellow lines edged with black, the more lateral ones often interrupted.

The margin of the notum is white, indistinctly set off from the blue ground color, containing black spots of different size, and bordered by a yellow line externally.

The tail is white with orange yellow lines and black spots, edged with blue.