Longsnout Seahorse Identification Guide

Key identification features

• Snout is notably long and thin, roughly as long as the rest of the head, longer in proportion than in most Atlantic seahorses
• Slender, elongated body with a tall coronet bearing five low, rounded knobs
• Coloration is highly variable: yellow, orange, red, purple, brown, or mottled combinations, often with fine white spots scattered across the body and tail
• Long, tapering, strongly prehensile tail used for gripping holdfasts such as sponges, soft corals, and gorgonians
• Adults typically reach 12-17 cm in height, with a thin, wiry build overall

Common look-alikes

• Lined seahorse: has a noticeably shorter, thicker snout and a heavier-set, stockier body
• Dwarf seahorse: much smaller overall size, usually under 5 cm, with a short stubby snout
• Spotted seahorse: smoother, lower coronet and a generally shorter, less tapered snout

Where you'll see one

The longsnout seahorse ranges through the western Atlantic from the southeastern United States and Bermuda south to Brazil. It clings to seagrass blades, mangrove roots, sponges, and soft corals from shallow lagoons down to about 55 meters, favoring sheltered, current-protected habitat where it can anchor its tail and ambush passing zooplankton and small crustaceans.