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Eumetazoa
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Eumetazoa (), also known as Epitheliozoa or Histozoa, is a proposed basal subkingdom as a of (sponges). The basal eumetazoan clades are the and the . is now also seen as a eumetazoan in the ParaHoxozoa. The competing hypothesis is the clade. The subkingdom and are the other taxa, and agnotozoa may be fake or even nonexistent at studies. Parazoa or Agnotozoa are a main sister group to eumetazoans, forming clade Blastozoa/Diploblastozoa. Alternatively, Parazoa was considered as a sister group to Agnotozoa(now considered polyphyletic). Several other extinct or obscure life forms, such as and , appear to have emerged in the group. Characteristics of eumetazoans include true tissues organized into , the presence of and , and an embryo that goes through a stage.

Some once speculated the sponges and eumetazoans separately from different single-celled organisms, which would have meant that the animal kingdom does not form a (a complete grouping of all organisms descended from a common ancestor). However, genetic studies and some morphological characteristics, like the common presence of , now unanimously support a common origin.

Traditionally, eumetazoans are a major group of in the Five Kingdoms classification of and K. V. Schwartz, comprising the and – all animals except the . "Systema Naturae 2000 Taxon: Subkingdom Eumetazoa". . Retrieved February 2, 2006


Taxonomy
A widely accepted hypothesis, based on molecular data (mostly 18S sequences), divides Bilateria into four : , , , and (sometimes included in Lophotrochozoa). The last three groups are also collectively known as .

However, some skeptics emphasize inconsistencies in the new data. The zoologist Claus Nielsen argues in his 2001 book Animal Evolution: Interrelationships of the Living Phyla for the traditional divisions of and .


Evolutionary origins
It has been suggested that one type of and one approach to interpretation of the fossil record both place the evolutionary origins of eumetazoa in the . However, the earliest eumetazoans may not have left a clear impact on the fossil record and other interpretations of molecular clocks suggest the possibility of an earlier origin. The discoverers of describe it as the fossil of a animal that appeared at the end of the glaciation prior to the period, implying an even earlier origin for eumetazoans.


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