Trapania brunnea

Images taken at Bare Island, NSW, Australia

The body is dark brown with a number of symmetrically arranged white patches and streaks. The brown body has scattered white dots. Both the anterior and posterior lateral processes are dark brown except for a basal region, and the tip, which are both translucent clear with white patches.

They are common on Pararhaphoxya sp (two-finger sponge) or sponges or Holopsamma laminaefavosa (cream honeycomb sponge). Whilst residing on sponges their radular teeth are actually more likely feeding on species of kamptozoa [entoprocts] which grow on these sponges.