Syngnathidae's a family of fish which includes the seahorses, the pipefishes, and the weedy and leafy sea dragons. The name's derived from Greek, meaning "fused jaw" - syn meaning fused or together, and gnathus meaning jaws. This fused jaw trait's something the entire family has in common. Description and biology Syngnathids are found in temperate and tropical seas across the world. Most species inhabit shallow, coastal waters, but a few are known from the open ocean, especially in association… (More on Syngnathidae)