Platyzoa

Platyzoa; Temporal range:
	Pseudobiceros bedfordi (Bedford's flatworm)
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Subkingdom:	Eumetazoa
Clade:	ParaHoxozoa
Clade:	Bilateria
Clade:	Nephrozoa
(unranked):	Protostomia
(unranked):	Spiralia
Superphylum:	Platyzoa; Cavalier-Smith, 1998
Phyla
	Gastrotricha; Gnathifera (unranked) Gnathostomulida; Micrognathozoa; Syndermata (Rotifera) including Acanthocephala; ; Chaetognatha; †Amiskwia (not placed in a phylum); †Timorebestia (stem-chaetognath); †Inquicus; †Nectocarididae?; ; Platyhelminthes; Mesozoa (unranked) Dicyemida; ?Monoblastozoa; ?Orthonectida; ;

The "Platyzoa" /ˌplætɪˈzoʊ.ə/ are a group of protostome unsegmented animals proposed by Thomas Cavalier-Smith in 1998. Cavalier-Smith included in Platyzoa the phylum Platyhelminthes (or flatworms), and a new phylum, the Acanthognatha, into which he gathered several previously described phyla of microscopic animals. Later it has been described as paraphyletic, containing the Rouphozoa and the Gnathifera. Since 2022 it is believed that Platyozoa are monophyletic and also includes Mesozoa.

Platyzoa Temporal range:

Pseudobiceros bedfordi (Bedford's flatworm)
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Subkingdom:	Eumetazoa
Clade:	ParaHoxozoa
Clade:	Bilateria
Clade:	Nephrozoa
(unranked):	Protostomia
(unranked):	Spiralia
Superphylum:	Platyzoa Cavalier-Smith, 1998
Phyla
Gastrotricha Gnathifera (unranked) Gnathostomulida Micrognathozoa Syndermata (Rotifera) including Acanthocephala Chaetognatha †Amiskwia (not placed in a phylum) †Timorebestia (stem-chaetognath) †Inquicus †Nectocarididae? Platyhelminthes Mesozoa (unranked) Dicyemida ?Monoblastozoa ?Orthonectida