Symbion americanus is a species of primitive animals belonging to the family Symbiidae.[1]
It is native to Northern America.[1] It is a microscopic marine invertebrate that lives as an ectocommensal on the mouthparts of the American lobster, Homarus americanus, specifically attaching to the setae. [2]
Obst, M.; Funch, P. & Kristensen, R.M. 2006: A new species of Cycliophora from the mouthparts of the American lobster, Homarus americanus (Nephropidae, Decapoda). Organisms diversity & evolution, 6: 83–97. doi:10.1016/j.ode.2005.05.001