Monoblastozoa
Encyclopedia
Monoblastozoa was granted the title of phylum after the recognition that Mesozoa
was too diverse to be a phylum unto itself.
and cultivated in laboratory by him. This animal has not been found since and its real existence is considered as doubtful.
More organised than Protozoa, but still very primitive multicellular organisms. Characterised by their distinct anterior/posterior parts and being densely ciliated, especially around "mouth" and "anus". They only have one layer of cells. They reproduce assexually by transverse fission of body. Although sexual reproduction was suspected, no evidence exists of it .
Mesozoa
The Mesozoa are enigmatic, minuscule, worm-like parasites of marine invertebrates. It is still unclear as to whether they are degenerate platyhelminthes or truly-primitive, basal metazoans. Generally, these tiny, elusive creatures consist of a somatoderm of ciliated cells surrounding one or...
was too diverse to be a phylum unto itself.
Species
Only one species has been described, Salinella salvae. It was discovered in 1892 by J. Frenzel in the saltpans of ArgentinaArgentina
Argentina , officially the Argentine Republic , is the second largest country in South America by land area, after Brazil. It is constituted as a federation of 23 provinces and an autonomous city, Buenos Aires...
and cultivated in laboratory by him. This animal has not been found since and its real existence is considered as doubtful.
More organised than Protozoa, but still very primitive multicellular organisms. Characterised by their distinct anterior/posterior parts and being densely ciliated, especially around "mouth" and "anus". They only have one layer of cells. They reproduce assexually by transverse fission of body. Although sexual reproduction was suspected, no evidence exists of it .