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Pronunciation varies by accent · noun
(biology) The hypothetical last common ancestor to all bilaterians..
2008, Philosophical Transactions: Biological Sciences, Volume 363, Issues 1493-1496, page 1523, This way, different aspects of the molecular architecture of the urbilaterian nervous system are reconstructed and yield insight into the degree of centralization that was in place in the bilaterian ancestors.
There is no fossil record to show that the urbilaterian existed. However, the echoes of the existence of this creature are recorded in stunning clarity in the genes of every living descendant, from fruit fly to spider to human.
The competing hypotheses of simple and complex urbilaterians are still being debated at the time of writing.
Use urbilaterian when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Urbilaterian means (biology) The hypothetical last common ancestor to all bilaterians..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
2008, Philosophical Transactions: Biological Sciences, Volume 363, Issues 1493-1496, page 1523, This way, different aspects of the molecular architecture of the urbilaterian nervous system are reconstructed and yield insight into the degree of centralization that was in place in the bilaterian ancestors.
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