Symbion is a genus of peculiar
animals, with a single species,
S. pandora. It was discovered in
1995 by
Kristensen[?] on the mouthparts of the Norwegian lobster
Nephrops[?].
Symbion does not appear to have any especially close relatives, and so was given its own phylum, called Cycliophora. It may be related to the
Ectoprocta and
Entoprocta.