This interesting creature is actually a sea dragon not a sea horse.

            Weedy Sea Dragons grow to a mature length of about 18 inches (45 cm). They use camouflage as their primary defense, and are found along the southern reefs and sandy underwater areas of Australia. Though relatively common compared to Leafy Sea Dragons, Weedy Sea Dragons are also government protected, and subject to strict export controls.

Though they are similar in appearance to sea horses, Weedy Sea Dragons do not have the (gripping) tails, but rather appear to use them for steering.

Scientific name: Phyllopteryx taeniolatus