Any lophobranch fish of the genus Siphostoma, or Syngnathus, and allied genera, having a long and very slender angular body, covered with bony plates. The mouth is small, at the end of a long, tubular snout. The male has a pouch on his belly, in which the incubation of the eggs takes place.

fish with long tubular snout and slim body covered with bony plates

elongate fish related to seahorses.

Pipefish (Syngnathinae) are small fish, which with the Seahorses form a distinct family. Pipefish look like straight-bodied seahorses with tiny mouths.