Aulostomoidei is a suborder of the order Syngnathiformes, which also contains groups such as the seahorses, pipefishes and dragonets.

Aulostomoidei. Retrieved May, 08 2021, from en.wikipedia.org/wiki/Aulostomoidei.

Aulostomoidei is a superfamily of the order Syngnathiformes, which also contains groups such as the seahorses, pipefishes and dragonets. It is one of two superfamilies which make up the suborder Aulostomoidei within the Syngnathiformes.

Aulostomoidea. Retrieved May, 08 2021, from en.wikipedia.org/wiki/Aulostomoidea.

The trumpetfishes are three species of highly specialized, tubular-elongated marine fishes in the genus Aulostomus, of the monogeneric family Aulostomidae. The trumpetfishes are members of the order Syngnathiformes, together with the seahorses and the similarly built, closely related cornetfishes. The generic name, Aulostomus, is a composite of two Greek words: aulos, meaning flute, and stoma, meaning mouth, because the species appear to have tubular snouts. "Flutemouth" is another less-common name for the members of the family (although this word is more often used to refer to closely related cornetfishes of the family Fistulariidae).

Aulostomidae. Retrieved May, 08 2021, from en.wikipedia.org/wiki/Trumpetfish.