● Clements KD,Bullivant S (1991). An unusual symbiont from the gut of surgeonfishes may be the largest known prokaryote. J. Bacteriol.173, 5359-62. ● Angert ER,Clements KD,Pace NR (1993). The largest bacterium. Nature362, 239-41. ● Montgomery WL,Pollak PE (1988). Epulopiscium-fishelsoni NG, N-SP, a protist of uncertain taxonomic affinities from the gut of an herbivorous reef fish. J. Protozool.35, 565-569.