Definitions
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun biology Any
animal that hasbilateral symmetry , namely those of the cladeBilateria
Etymologies
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Examples
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For the first time, HMG domain sequences from non-bilaterian phyla (Calcispongia, Demospongiae, Ctenophora and Cnidaria) have been included in a phylogenetic study of the SOX family.
As Expected 2008
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The same genes that patterned the front and back of the bilaterian embryo, for example, were produced on opposite sides of the anemone embryo.
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Among the completely sequenced bilaterian genomes, only the vertebrates have a higher number of SOX genes (e.g., 20 genes in H. sapiens and M. musculus, 24 genes in F. rubripes).
As Expected 2008
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Further studies showed that cnidarians used other genes from the bilaterian tool kit.
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OK we have all bilaterian animals - that is the animals which have an axis of symmetry running down the middle.
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Complex embryos displaying bilaterian characters from Precambrian
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Still, one can conceptually talk about different stages of life's history, such as the OOL, the last universal common ancestor, the origin of the eukaryotic cell, the first multicellular organisms, the later bilaterian ancestor, the establishment of the modern animal phyla, and all the way down to modern speciation.
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"Because all three main clades of bilaterian animals express a let-7 RNA that is temporally regulated, but cnidarian, poriferan and all non-animal species that we analysed do not express a detectable let-7 RNA, we propose that the gene evolved after the divergence of diploblastic and bilaterian animals"
Teach the Controversy James F. McGrath 2008
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The last common ancestor of all bilaterian animals was a worm, and we can see that ancestry in the organization of most animals today, even when it is obscured by odd little geegaws, like limbs and armor and regional specializations and various dangly spiky jointed bits.
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This animal is not descended from that bilaterian worm we take for granted, at any rate.
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