The Trochozoa are a proposed Lophotrochozoa clade that is a sister clade of Bryozoa and Platyzoa. The clade would include animals in five phyla: the Nemertea, the Annelida, the Mollusca, and the two Brachiozoan phyla, Brachiopoda and Phoronida. Both annelids and molluscs have been suggested as the sister group of Brachiozoa. It has also been proposed that nemerteans are actually a clade of annelids.

Phylogeny

SpiraliaGnathifera Platytrochozoa Rouphozoa Gastrotricha Platyhelminthes Lophotrochozoa Polyzoa Entoprocta Cycliophora Bryozoa/Ectoprocta Trochozoa Brachiozoa Brachiopoda Phoronida Mollusca Annelida Echiura Clitellata Siboglinidae Sipuncula Nemertea
Gnathifera
PlatytrochozoaRouphozoa Gastrotricha Platyhelminthes Lophotrochozoa Polyzoa Entoprocta Cycliophora Bryozoa/Ectoprocta Trochozoa Brachiozoa Brachiopoda Phoronida Mollusca Annelida Echiura Clitellata Siboglinidae Sipuncula Nemertea
RouphozoaGastrotricha Platyhelminthes
Gastrotricha
Platyhelminthes
LophotrochozoaPolyzoa Entoprocta Cycliophora Bryozoa/Ectoprocta Trochozoa Brachiozoa Brachiopoda Phoronida Mollusca Annelida Echiura Clitellata Siboglinidae Sipuncula Nemertea
PolyzoaEntoprocta Cycliophora Bryozoa/Ectoprocta
Entoprocta Cycliophora
Entoprocta
Cycliophora
Bryozoa/Ectoprocta
TrochozoaBrachiozoa Brachiopoda Phoronida Mollusca Annelida Echiura Clitellata Siboglinidae Sipuncula Nemertea
Brachiozoa Brachiopoda Phoronida Mollusca Annelida Echiura Clitellata Siboglinidae Sipuncula
Brachiozoa Brachiopoda Phoronida Mollusca
BrachiozoaBrachiopoda Phoronida
Brachiopoda
Phoronida
Mollusca
AnnelidaEchiura Clitellata Siboglinidae Sipuncula
Echiura Clitellata Siboglinidae
Echiura
Clitellata Siboglinidae
Clitellata
Siboglinidae
Sipuncula
Nemertea