Gnathifera (phylum)
Encyclopedia
Gnathifera is an assemblage of phyla of metazoans.

"Acanthognatha" is a similar grouping, including rotifer
Rotifer
The rotifers make up a phylum of microscopic and near-microscopic pseudocoelomate animals. They were first described by Rev. John Harris in 1696, and other forms were described by Anton van Leeuwenhoek in 1703...

s, acanthocephalans, gastrotrich
Gastrotrich
The gastrotrichs are a phylum of microscopic animals abundant in fresh water and marine environments. Most fresh water species are part of the periphyton and benthos...

s, and gnathostomulid
Gnathostomulid
Gnathostomulids, or jaw worms, are a small phylum of nearly microscopic marine animals. They inhabit sand and mud beneath shallow coastal waters and can survive in relatively anoxic environments. They were first recognised and described in 1956....

s.
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