What defines Eumetazoa?
: a major division of the animal kingdom comprising all multicellular forms except the sponges — compare parazoa.
What is meant by Eumetazoa?
Eumetazoa. Eumetazoa is a clade comprising all major animal groups except sponges, placozoa, and several other obscure or extinct life forms, such as Dickinsonia. Characteristics of eumetazoans include true tissues organized into germ layers, and an embryo that goes through a gastrula stage.
What is Parazoa and Eumetazoa?
Eumetazoa are animals whose tissue are organized into true tissues and there is a development of organs. Parazoa lack this tissue organization. This signifiies that eumetazoa have more complexly organized tissue than parazoa do. Examples of parazoa belong to phylum porifera, or sponges.
What is another name for Eumetazoa?
Eumetazoa (Greek: εὖ [eu], well + μετά [metá], after + ζῷον [zóon], animal), also known as Diploblasts, Epitheliozoa, or Histozoa, are a proposed basal animal clade as a sister group of the Porifera. The basal Eumetazoan clades are the Ctenophora and the ParaHoxozoa. Placozoa is now also seen as an Eumetazoan in the ParaHoxozoa.
What is the meaning of Metazoa?
Eu·metazoa | (¦)yü+. in some classifications. : a major division of the animal kingdom comprising all multicellular forms except the sponges — compare parazoa.
What are the basal Eumetazoan clades?
The basal Eumetazoan clades are the Ctenophora and the ParaHoxozoa. Placozoa is now also seen as an Eumetazoan in the ParaHoxozoa. Several other extinct or obscure life forms, such as Iotuba and Thectardis appear to have emerged in the group.
Do sponges and eumetazoans belong to the animal kingdom?
Some phylogenists have speculated the sponges and eumetazoans evolved separately from single-celled organisms, which would mean that the animal kingdom does not form a clade (a complete grouping of all organisms descended from a common ancestor).