Skeleton complement of Metschnikowia tuberculata. A–C Spicules of encrusting sponges D spicules of a globular sponge E skeleton arrangement of a globular sponge F skeleton arrangement of an encrusting sponge. Scale bars: 30 µm (A–D whole spicules); 2 µm (A–D magnified parts); 250 µm (E, F).