Gnathostomulida (Jaw Worms)

Phylum Gnathostomulida (Jaw Worms)

Wikipedia Entry

Approximate Number of Species: 150

Largest:  Haplognathia sp. at a length of  0.17 inches (4.35 mm)

Haplognathia gnathostomulida photo by Martin V. Sorensen
Jaws of Haplognathia - photo by Martin V Sorensen

Smallest:  Problognathia minima at a length of  0.009 inches (0.23 mm)

Gnathostomulida photo by Matthew Hooge

References:

Brusca RC & Brusca GJ (2003) Invertebrates (Sinauer Associates, Inc., Publishers, Sunderland, MA) 2nd Ed.

W. Sterrer, personal communication