Placozoa
/ˌplækəˈzəʊə/- Zoology a minor phylum that contains a single minute marine invertebrate (Trichoplax adhaerens), which has a flattened body with two cell layers and is the simplest known metazoan【动】扁盘动物。
词源
modern Latin (plural), from Greek plakos 'flat' + zōia 'animals'.