||Appears as an overlap of two radially deployed circular arrays of feathers. As seen in the photographs shown here, colours can vary considerably, although the most common pattern is the banded brown and white seen in the title illustration.
|| The parchment-like tube can sometimes protrude more generously from the base surface.
||Usually found on coral boulders (like Great Star Coral masses).
||Will promptly retract into its tube if approached too closely.