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Pronunciation varies by accent · noun
(zoology) Any animal that has bilateral symmetry, collectively grouped in the clade Bilateria..
Whatever the phylogenetic relationship among bilaterians and the diploblastic phyla, there was clearly a significant expansion in genomic information within the internode that connects the bilaterian clade to other branches.
Lacking body cavities and both circulatory and excretory organs, with subepidermal nerve plexuses and 'brains' represented, if at all, by thickened anterior commissures, and with simple reproductive set-ups, acoels come close to representing a model stem ancestor for bilaterians.
In most bilaterians, the gut musculature and most vascular muscles derive from the mesoderm.
Use bilaterian when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Bilaterian means (zoology) Any animal that has bilateral symmetry, collectively grouped in the clade Bilateria..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Whatever the phylogenetic relationship among bilaterians and the diploblastic phyla, there was clearly a significant expansion in genomic information within the internode that connects the bilaterian clade to other branches.
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