Placozoa are simple, flat, multicellular organisms that primarily inhabit marine environments, particularly in shallow coastal waters. They are often found on surfaces like rocks, coral reefs, and decomposing organic matter, where they feed on microorganisms and organic particles. Their ability to thrive in various habitats makes them adaptable, but they are still relatively understudied compared to other marine invertebrates.
Placozoa
Although most of the animal phyla are included in the deuterostomes and protostomes, cnidaria, porifera, placozoa and ctenophora are not included in the group of animals know as Bilateria (which contains the deuterostomes and protostomes). Cnidarians and ctenophores are in a group called Radiata, and Porifera and Placozoa are in the group known as Parazoa.
are large, flat, amoeba-like creature up to 0.078 in (2 mm) in diameter; the grayish white body of the organism consists of several thousand cells that form two epithelia but are not organized into tissues and organs.
The animal kingdom is divided into five groups for classification purposes. They are called Ctenophora, Porifera, Placozoa, Cnidaria, and Bilateria.
actually seven of the 9 phyla use extracellular digestion. the two that are intracellular are porifera and placozoa
Phyla such as Porifera (sponges) lack organs and have asymmetrical or no specific body symmetry. Another example is Placozoa, which also lack organs and have asymmetrical body shapes.
The smallest group of invertebrates is the phylum Placozoa, which consists of a single known species, Trichoplax adhaerens. These simple, flattened organisms are composed of only a few cell layers and lack organs or distinct tissues.
Mesozoa are simple, multicellular organisms typically composed of a few cell layers and are often categorized as having a bilateral symmetry, although some exhibit a more simplified structure. They generally lack specialized tissues and organs, consisting mainly of elongated, worm-like forms. Placozoa, on the other hand, are even simpler, consisting of a flattened, multicellular body that is only a few cell layers thick, with a dorsal and ventral side, and exhibit a unique, amorphous body plan without true symmetry. Both groups represent some of the most primitive forms of multicellular life, showcasing early evolutionary traits.
Subregnum: ParazoaPhylum: PoriferaSubregnum: AgnotozoaSuperphylum: RadiataPhylum: BrachiopodaPhylum: BryozoaPhylum: DicyemidaPhylum: EntoproctaPhylum: Gastrotricha
Live Live Live Extra was created on 1995-12-31.
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Live A Live happened in 1994.