Flatworms

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Taxonomic Classification
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Kingdom: Animalia
Subkingdom: Eumetazoa
Clade: ParaHoxozoa
Clade: Bilateria
Clade: Nephrozoa
Unranked: Protostomia
Unranked: Spiralia
Clade: Rouphozoa
Phylum: Platyhelminthes
Source: Integrated Taxonomic Information System
Attribute Cnidarians and Ctenophores[1] Platyhelminthes (flatworms)[2][3] More "advanced" bilaterians[4]
Bilateral symmetry No Yes
Number of main cell layers Two, with jelly-like layer between them (mesoglea) Three
Distinct brain No Yes
Specialized digestive system No Yes
Specialized excretory system No Yes
Body cavity containing internal organs No Yes
Specialized circulatory and respiratory organs No Yes
  1. Cite error: Invalid <ref> tag; no text was provided for refs named Hinde2001CnidariaAndCtenophoraInAnderson
  2. Cite error: Invalid <ref> tag; no text was provided for refs named WalkerAnderson2001PlatyhelminthesInAnderson
  3. Cite error: Invalid <ref> tag; no text was provided for refs named RuppertBarnes2004Platyhelminthes
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