Placobranchus Hasselt, 1824 Plakobranchus is a genus of sea slugs, sacoglossans, marine opisthobranch gastropod mollusks in the family Plakobranchidae.

[2] The author of the genus spelled the name originally as Plakobranchus, but the spelling Placobranchus was a long time the prevailing usage, based on an incorrect subsequent spelling by Férussac (1824) in a translation of van Hasselt's work.

Species within the genus Plakobranchus include: Recent work on the photosynthetic abilities of Plakobranchus reveals that P. ocellatus is actually a species complex.

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