Benthocodon is a genus of hydrozoans of the family Rhopalonematidae.

[1] The genus contains two known species: Benthocodon hyalinus[2] and Benthocodon pedunculatus,[3] however due to the small size and red pigmentation, they can easily be confused with related genera.

Rather, they spend their entire lives in the water column as plankton.

They eat by paralyzing their prey using their red tentacles then they pull it in to consume.

They also have a red inner membrane which helps when hunting due to it masking the bioluminescence of their prey so they can eat without attracting predators.