What are basal metazoans?
The term "basal metazoans" refers to animals at the base of the evolutionary tree of methazoans (multicellular animal). The term is not very well defined and may apply to Cnidarians (jellyfish and relatives), poriphera (mushrooms), ceno -formation (ridge jelly), placozoans (a single animal with a single species, also trichoplax adhaerens ) and extinct species, as well as trichoplax adhaerens ) ), as well as trichoplax adhaerens ) as well as excreting species, as well as trichoplax adhaerens ) as well as trichoplax adhaerens ), as well as trichoplax adhaerens ), as well as trichoplax adhaerens, as well as ediacaran fauna).
The most basic of all living methazoans can be trichoplax adhaerens , simple, very small (0.5 mm) balloon animal named for its tendency to hold sides of the glass aquarium. Trichoplax has the smallest genome from any known animal, with only 50 megabase DNA and 6 chromosomes. The sequence of genome is currently underwayU trichoplax . It is assumed that this may be related to Cnidarians and CTenoforms. However, some recent molecular studies have indicated the trichoplax after mushrooms and cnidarians could divide from the rest of the animals. This is quite a surprise, because Cnidarians are obviously more complicated than mushrooms. The finding shows that morphology (appearance) cannot be used as a scale for how soon the organism has separated from others, because some animals become less complex, not more over time. This is contrary to many popular prerequisites about evolution.
Another interesting group of basal metazoans are Mesozoa, once considered to be mediated between Protozoa (unicellular organisms) and mesozoa (multicellular organisms), now considered a simplified form of methazoan or real basal met.Azoan. Two main mesozoan groups are rhombozoa and orthonectis, simple organisms that KTEThere are little known. They are small parasites of sea invertebrate and some have only dozens of cells. If you want to learn more about these animals, their genomes must be sequenced.
A group of extinct metazoan, perhaps the most basic of all methazoans, may not be, are Ediacaran Fauna, a group of quilted mattresses and organisms similar to bags that lived an extremely long time in the past, during the Edicaran period about 600 and 542 million years ago. These animals have been classified by some workers in their own group, Vendobiot, based on their similar "quilted" appearance, although there is a great discussion. Fauna Ediacaran was described as "early unsuccessful animal experiment". Since this group has been bent for a long time, we will never get to its genetic material and are limited to argue exclusively on raw morphologists.