Brady, 1883 
Syringammina fragilissima is a nematodes. It is unusual in that the cell has multiple nuclei.
It is not known how the organism feeds or reproduces. However, it has been shown to have high concentrations of lipids within its cytosol, which suggests that it may feed on bacteria from the sediment that makes up the "sand tubes."
- Ole Tendal (2009). Brady, 1883"Syringammina fragillissima".
- "As large as life".
- Michael Marshall (February 3, 2010). "Zoologger: 'Living beach ball' is giant single cell".
- J. Alan Hughes & Andrew J. Gooday (2004). "Associations between living benthic foraminifera and dead tests of Syringammina fragilissima (Xenophyophorea) in the Darwin Mounds region (NE Atlantic)". Deep Sea Research Part I: Oceanographic Research Papers 51 (11): 1741–1758.
- Laureillard, J., L. Méjanelle, and M. Sibuet. "Use of Lipids to Study the Trophic Ecology of Deep-sea Xenophyophores." Marine Ecology Progress Series 270 (2004): 129-40. Print.