Common seadragons are found in seagrass and kelp beds of coastal Australia.
Their subtle movements mimic the swaying of underwater vegetation, while their leaf-like appendages help to camouflage them from predators.
Like other members of the family Syngnathidae (seahorses and pipefishes), the males brood eggs in a pouch located under their tails.
Habitat degradation and collection for the aquarium trade have been identified as threats to this species.