metazoa
higher, multicellular animals; contrast to protozoa
Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby ...
Metazoa
[Gr. meta - after, beyond; Gr. zoon - animal]. The Subkingdom of the Kingdom Animalia that includes all mulitcellular animals developing from embryos and possessing differentiated cells which form into tissues.
In metazoan cells there are A and B type lamins which differ in their length and pI. Human cells have three differentially regulated genes. B-type lamins are present in every cell.
The metazoa (animals) are described in two separate pages:
The Invertebrates and
The Vertebrates ...
The story of metazoan evolution is a story of genomic duplication. Primates are not an exception and the human genome reflects a rich history of recent duplication events that are a source of contemporary genomic variability and instability.
Introduction to the Metazoa: Animals, Animals, Animals! This University of California Berkeley Museum of Paleontology site offers excellent information about the evolution and diversity of various animal groups.
Computational analysis of metazoan genomes suggests that the prevalence of the TATA box has been overestimated in the past and that the majority of human genes are TATA-less.
Although all eukaryotes contain the common cytoskeletal elements actin and tubulin (both free in the cytoplasm and polymerized in the form of microfilaments and microtubules), intermediate filaments are found only in some metazoan species, ...
Hedgehog proteins are involved in patterning in just about all metazoans-multi-cellular animals. Everything from fruit flies on up to humans all have some form of Hedgehog. Drosophila only have one Hedgehog gene.
extracellular matrix -- (ECM) Region outside of metazoan cells which includes compounds attached to the plasma membrane, as well as dissolved substances attracted to the surface charge of the cells.
There is also typically an internal digestive chamber, with one or two openings. Animals with this sort of organization are called metazoans, or eumetazoans when the former is used for animals in general.
gametic meiosis. Meiosis that occurs during formation of the gametes, as in humans and other metazoa.
gametocyst Cyst produced by some apicomplexan parasites. Sexual reproduction and spore formation occurs within this cyst.
Possessing three germ layers: the endoderm, mesoderm, and ectoderm. Most eumetazoa are triploblastic.
trophic level ...
Bennett, W. N. and M. E. Boraas. 1989. "A demographic profile of the fastest growing metazoan: a strain of Brachionus calyciflorus (Rotifera)." Oikos. 55: 365-369.
In development the theme of universal processes is also present, for example most metazoan organism the basic steps of the early embryo development share similar morphological stages and include similar genes.
 See also: Organ, Animal, Plant, Animals, Trans
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