Platyzoa
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The "Platyzoa" are a group of protostome unsegmented animals proposed by Thomas Cavalier-Smith in 1998. Cavalier-Smith included in Platyzoa the phylum Platyhelminthes, and a new phylum, the Acanthogna
Bedford's Flatworm
Spiralia
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The Spiralia are a morphologically diverse clade of protostome animals, including within their number the molluscs, annelids, platyhelminths and other taxa. The term Spiralia is applied to those phyla
Platyzoa
…is used because most members are flat, though rotifers are not. The Platyzoa are close relatives of the Lophotrochozoa. Together the two make up the Spiralia. Syndermata was a proposed clade that included Acanthocephala and rotifers, but as it appears they are not sister groups after all, the clade has been…
Spiralia clade