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Concept
Eumetazoa
Summary
Automatic taxobox
| name = Eumetazoans
| fossil_range = Ediacaran - Present,
| image =
File:Animalia diversity.jpg|300px
rect 0 0 400 290 [[Mollusca]]
rect 400 0 800 275 [[Scyphozoa]]
rect 0 300 400 775 [[Chordata]]
rect 400 280 800 775 [[Arthropod]]
rect 0 800 800 1100 [[Annelida]]
| image_caption = Diversity of eumetazoans
| display_parents = 7
| taxon = Eumetazoa
| authority = Buetschli, 1910
| subdivision_ranks = Phyla
| subdivision = * Ctenophora
† Trilobozoa
Chancelloriida
†Proarticulata
†Petalonamae
ParaHoxozoa (unranked)
Placozoa
Cnidaria
Bilateria (unranked)
Xenacoelomorpha?
Nephrozoa (unranked)
Superphylum Deuterostomia
Chordata
"Ambulacraria"
Hemichordata
Echinodermata
Xenacoelomorpha?
Protostomia (unranked)
Superphylum Ecdysozoa
Kinorhyncha
Loricifera
Priapulida
Nematoda
Nematomorpha
Onychophora
Tardigrada
Arthropoda
Spiralia (unranked)
Orthonectida
Rhombozoa
Chaetognatha
Superphylum Platyzoa
Platyhelminthes
Gastrotricha
Rotifera
Acanthocephala
Gnathostomulida
Micrognathozoa
Cycliophora
Superphylum Lophotrochozoa
Hyolitha†
Nemertea
Phoronida
Bryozoa
Entoprocta
Brachiopoda
Mollusca
Annelida
| synonyms = *Enterozoa Lankester, 1877, em. Beklemishev
Epitheliozoa Ax, 1996
Diploblast Lankester, 1873
Histozoa Ulrich, 1950
Eumetazoa (), also known as diploblasts, Epitheliozoa, or Histozoa', are a proposed basal animal clade as a sister group of the Porifera (sponges). The basal eumetazoan clades are the Ctenophora and the ParaHoxozoa. Placozoa is now also seen as a eumetazoan in the ParaHoxozoa. The competing hypothesis is the Myriazoa clade.
Several other extinct or obscure life forms, such as Iotuba and Thectardis, appear to have emerged in the group. Characteristics of eumetazoans include true tissues organized into germ layers, the presence of neurons and muscles, and an embryo that goes through a gastrula stage.
Some phylogenists once speculated the sponges and eumetazoans evolved separately from different single-celled organisms, which would have meant that the animal kingdom does not form a clade (a complete grouping of all organisms descended from a common ancestor).
Official source
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