The body is translucent white or slightly yellowish in colour. The tips of the rhinophores, oral tentacles and tail are dusted with white. The digestive gland in the cerata is dark brown, green or possibly red. There is no pigment on the surfaces of the cerata. The rhinophores have small annular wrinkles.
Paraflabellina gabiniereii feeds on hydroids of the genus Dynamena, Podocoryne, Obelia, Sertularella and Eudendrium ramosum.