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Pygmy Seahorse
Hippocampus bargibanti
Exclusively on Muricella sea fans at 10-40 meters on coral reefs.
Under 2.5 cm total length. Pink or yellow, covered in tubercles matching the polyps of its host gorgonian.
Identification
At under 2.5 cm, the Bargibant's pygmy seahorse is one of the smallest vertebrates in the ocean. The body is covered in bulbous tubercles that match the polyp spacing of its host Muricella gorgonian sea fan. Color ranges from pink with red tubercles to yellow with orange tubercles — always matching the host fan so perfectly that the species was unknown to science until 1969, when one was discovered in a collected fan at a laboratory.
Distribution & Habitat
Bargibanti pygmies are restricted to Muricella sea fans in the western Pacific: Indonesia, the Philippines, Papua New Guinea, and southern Japan. They spend their entire adult lives on a single host fan, rarely moving more than a few centimeters.
Behavior
Like all seahorses, pygmies are monogamous (at least serially) and males brood the eggs. The male has a small pouch in the trunk rather than the tail like larger Hippocampus species. A brood contains a few dozen tiny babies, released as miniatures of the adults.
Where to See Them
Lembeh Strait (Indonesia), Anilao (Philippines), Raja Ampat, and Milne Bay (Papua New Guinea) are classic pygmy seahorse sites. You will need a dedicated muck or critter guide to find them — they are effectively invisible without one. Do not point strobes directly at the animal for extended periods; repeated flash exposure stresses them.
Western Pacific: Indonesia, Philippines, Papua New Guinea, southern Japan.
Lives entire adult life on a single sea fan. Males brood eggs in a trunk pouch. Discovered only when a coral was collected for aquarium display.
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