Members of this phylum are marine worms less than 1mm long. They have no body cavity but do have a pair of jaws which gives them their name (gnathos is Greek for jaws) and a blind gut with a mouth but no anus. They are very common in marine sediments where they eat bacteria, fungi and protists, and there are about 80 known species.
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- The Sand Worms (Phylum Gnathostomula) Description of the tiny marine worms in this phylum and the characteristics that distinguish them from other worms.
- Phylum Gnathostomulida Images of some members of this taxonomic group.