Introduction to Placozoa
- Information and a photograph of these strange organisms which have never been observed in their natural habitat.
- http://www.ucmp.berkeley.edu/phyla/placozoa/placozoa.html

Trichoplax
- Information from Wikipedia on this genus of simple marine organisms, with a photograph.
- http://en.wikipedia.org/wiki/Trichoplax

A Weird Wee Beastie: Trichoplax adhaerens
- Article by Richard Howey on this organism which is considered to be the most primitive multi-cellular animal known.
- http://www.microscopy-uk.org.uk/mag/artoct98/tricho.html