The leafy seadragon or Glauert's seadragon, Phycodurus eques, is a
marine fish in the family Syngnathidae, which also includes the seahorses.
It is the only member of the genus Phycodurus.
It is found along the southern and western coasts of Australia. The
name is derived from the appearance, with long leaf-like protrusions coming
from all over the body. These protrusions are not used for propulsion; they
serve only as camouflage. The leafy seadragon propels itself by means of a
pectoral fin on the ridge of its neck and a dorsal fin on its back closer
to the tail end. These small fins are almost completely transparent and
difficult to see as they undulate minutely to move the creature sedately
through the water, completing the illusion of floating seaweed.
Popularly known as "leafies", it is the marine emblem of the state of
South Australia and a focus for local marine conservation.
Photo 20, Oct 2010, Boston Aquarium