Information about Parazoa
| Parazoa Fossil range: Ediacaran - Recent | ||||||
|---|---|---|---|---|---|---|
) A sponge A sponge | ||||||
| Scientific classification | ||||||
| ||||||
| Phylum | ||||||
| Porifera | ||||||
The Parazoa are an ancestral subkingdom of animals, literally translated as "beside the animals". Parazoans differ from their choanoflagellate ancestors in that they are macroscopic and have differentiated cells, but unlike "true animals" (Eumetazoa), they do not have tissues. The only surviving parazoans are the sponges, which belong to the phylum Porifera. Some include Placozoa, a phylum that consists of only one species, Trichoplax adhaerens, in the division, but they are also sometimes placed in the subkingdom Agnotozoa. Parazoa are Asymmetrical (meaning they display no symmetry) all other animals will display some sort of symmetry. There are currently 5000 species, 150 of which are freshwater. Larvae are planktonic and adults are sessile.
References
- http://www.jochemnet.de/fiu/BSC1011/BSC1011_12/sld001.htm
- Biology 7th edition, Campbell and Reece, 2005
Cryogenian
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Scientific classification or biological classification is a method by which biologists group and categorize species of organisms. Scientific classification also can be called scientific taxonomy, but should be distinguished from folk taxonomy, which lacks scientific basis.
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Porifera
Grant in Todd, 1836
Classes
Calcarea
Hexactinellida
Demospongiae
The sponges or poriferans (from Latin "pore" and "to bear") are animals of the phylum Porifera. Porifera translates to "Pore-bearer".
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Grant in Todd, 1836
Classes
Calcarea
Hexactinellida
Demospongiae
The sponges or poriferans (from Latin "pore" and "to bear") are animals of the phylum Porifera. Porifera translates to "Pore-bearer".
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Choanoflagellatea
The choanoflagellates are a group of flagellate protozoa. They are considered to be the closest living relatives of the animals, and the last unicellular ancestors of animals are thought to have resembled modern choanoflagellates.
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The choanoflagellates are a group of flagellate protozoa. They are considered to be the closest living relatives of the animals, and the last unicellular ancestors of animals are thought to have resembled modern choanoflagellates.
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Cellular differentiation is a concept from developmental biology describing the process by which cells acquire a "type". The morphology of a cell may change dramatically during differentiation, but the genetic material remains the same, with few exceptions.
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Eumetazoa
Butschli, 1910
subgroups
Eumetazoa is a clade comprising all major animal groups except sponges.
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Butschli, 1910
subgroups
- Placozoa
- Radiata
- Bilateria
Eumetazoa is a clade comprising all major animal groups except sponges.
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Biological tissue is a collection of interconnected cells that perform a similar function within an organism.
The study of tissue is known as histology, or, in connection with disease, histopathology.
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The study of tissue is known as histology, or, in connection with disease, histopathology.
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Porifera
Grant in Todd, 1836
Classes
Calcarea
Hexactinellida
Demospongiae
The sponges or poriferans (from Latin "pore" and "to bear") are animals of the phylum Porifera. Porifera translates to "Pore-bearer".
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Grant in Todd, 1836
Classes
Calcarea
Hexactinellida
Demospongiae
The sponges or poriferans (from Latin "pore" and "to bear") are animals of the phylum Porifera. Porifera translates to "Pore-bearer".
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Porifera
Grant in Todd, 1836
Classes
Calcarea
Hexactinellida
Demospongiae
The sponges or poriferans (from Latin "pore" and "to bear") are animals of the phylum Porifera. Porifera translates to "Pore-bearer".
..... Click the link for more information.
Grant in Todd, 1836
Classes
Calcarea
Hexactinellida
Demospongiae
The sponges or poriferans (from Latin "pore" and "to bear") are animals of the phylum Porifera. Porifera translates to "Pore-bearer".
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Agnotozoa is the name of a taxon of simple animals. The name first appeared in an invertebrate paleontology book as one of the "branches" of the subkingdom Metazoa. The branch contained only one phylum: Mesozoa.
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