Platytrochozoa

The Platytrochozoa are a proposed basal clade of spiralian animals as the sister group of the Gnathifera. The Platytrochozoa were divided into the Rouphozoa and the Lophotrochozoa. A more recent study suggests that the mesozoans also belong to this group of animals, as sister of the Rouphozoa.

 Spiralia 

Gnathifera

 Platytrochozoa 
 Rouphozoa 

Gastrotricha

Platyhelminthes

Mesozoa

   

Lophotrochozoa

Platytrochozoa
Scientific classification
Domain: Eukaryota
Kingdom: Animalia
Subkingdom: Eumetazoa
Clade: ParaHoxozoa
Clade: Bilateria
Clade: Nephrozoa
(unranked): Protostomia
(unranked): Spiralia
Clade: Platytrochozoa
Struck et al. 2014
Clade

An alternative phylogeny was given in 2019, with a basal grouping of Mollusca and Entoprocta named Tetraneuralia, and a second grouping of Nemertea and Platyhelminthes named Parenchymia as sister of Annelida. In this proposal, Lophotrochozoa would become roughly synonymous with Platytrochozoa, and Rouphozoa would be unsupported.

 Protostomia 

Ecdysozoa

 Spiralia (s.l.) /

Gnathifera



 Lophotrochozoa / 
 Tetraneuralia 
 

Mollusca

Entoprocta


 
 

Gastrotricha

 Lophophorata 
 
 

Ectoprocta

Phoronida

Brachiopoda

Annelida

 Parenchymia 
 

Platyhelminthes

Nemertea

 Platytrochozoa / 
Spiralia (s.s.)
 Gnathospiralia 
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