Topic summary
Placozoans
Extracted from the Wikipedia article Placozoa.
Anatomy
Placozoans lack a well-defined body plan and have a simple, flattened body. As Andrew Masterson reported: "they are as close as it is possible to get to being simply a little living blob." An individual body measures about 0.55 mm in diameter. There are no body parts; as one of the researchers Michael Eitel described: "There's no mouth, there's no back, no nerve cells, nothing." Animals studied in laboratories have bodies consisting of everything from hundreds to millions of cells.