Flatworms
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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 | Platyhelminthes (flatworms) | More "advanced" bilaterians }} |
---|---|---|---|
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 |