Peniculisa is a genus of marine parasitic copepods in the family Pennellidae.

[2] Organisms from this genus are often found attached to the bodies and fins of fishes in the South Pacific and Indian oceans.

[3][4] Individual fishes have been reported to harbor hundreds of Peniculisa wilsoni parasites.

[4][5] Infection intensity is rarely cited for other Peniculisa species.

Peniculisa parasitic infections tend to be limited to tetraodontiform and pomacentrid fishes.