Some authors include Placozoa , a phylum that consists of only one species , `` Trichoplax adhaerens '' , in the division , but they are also sometimes placed in the subkingdom Agnotozoa .
Some include Placozoa , a phylum that consists of only one species , `` Trichoplax adhaerens '' , in the division , but they are also sometimes placed in the subkingdom Agnotozoa .