Loricifera (Brush Heads)

Phylum Loricifera (Brush Heads)

Wikipedia Entry

Approximate Number of Species: 80

Largest: Rugiloricus carolinus at a length of  0.02 inches (0.508 mm)

Smallest: Nanaloricus mysticus at a length of  0.0005 inches (0.0114 mm)

References:

Kristensen RM (2004) An introduction to Loricifera, Cycliophora, and Micrognathozoa. Integrative and Comparative Biology 42:641-651.

Higgins RP & Thiel H eds (1988) Introduction to the study of meiofauna (Smithsonian Institute Press, Washington, D.C.).