The spiny seahorse is relatively rare but widespread throughout the Indo-Pacific. The thorny seahorse found here at Malapascua, Philippines, can reach a length of 15-17 cm.
The spiny seahorse (Hippocampus histrix), or the thorny seahorse, is a small marine fish in the Syngnathidae family, native to the Indo-Pacific area. It is classified as a vulnerable species by the IUCN.
The species favours relatively deep waters (10–95 m) and is usually found below 15 m depths. This species is located on various substrates, including sponges, weedy rocky reefs, and soft corals but mainly on seagrass beds.
The trunk has long thorns, which continue until the coronet, which has 4–5. The snout is very long and tapered. Body coloration is highly variable to match surroundings and goes from grey to cream, bright yellow, green or red and even brownish.