"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", ...
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and γνάθος (gnathos), meaning "jaw". This fused jaw trait is something the entire family has in common." - (en.wikipedia.org 28.06.2021)