The Syngnathidae is a family of fish which includes seahorses pipefishes and seadragons Phycodurus and Phyllopteryx.
The name is derived from Greek σύν syn meaning together and γνάθος gnathos meaning jaw.
This fused jaw trait is something the entire family has in common.
Scientific classificatione
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Clade: Percomorpha
Order: Syngnathiformes
Superfamily: Syngnathoidea
Family: Syngnathidae
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 with sargassum mats.
They are characterised by their elongated snouts fused jaws the absence of pelvic fins and by thick plates of bony armour covering their bodies.
The armour gives them a rigid body so they swim by rapidly fanning their fins.
As a result they are relatively slow compared with other fishes but are able to control their movements with great precision including hovering in place for extended periods.
Источник: rutube.ru