Aplysina archeri is a species of
sponge that has long tube-like structures of cylindrical shape. Many tubes are attached to one particular part of the organism; a single tube can grow up to 5 feet (1.5 m) high and 3 inches (7.6 cm) thick. These sponges mostly live in the
Atlantic Ocean. These
filter feeders eat food such as
plankton or suspended
detritus as it passes them.
Photograph: Nick Hobgood