The urbilaterian (from German ur- 'original') is the hypothetical last common ancestor of the bilaterian clade, i.e., all animals having a bilateral symmetry.
The urbilaterian (from German ur- 'original') is the hypothetical last common ancestor of the bilaterian clade, i.e., all animals having a bilateral symmetry...
indicated with dashed lines. Embryological origins of the mouth and anus Urbilaterian, a hypothethical common ancestor to Protostomes and Deuterostomes Hejnol...
explanation leads to the formation of the bilaterian body plan; the urbilaterian would develop its symmetry when one end of the placula became adapted...
hypothetical most recent common ancestor of all bilateria is termed the "Urbilaterian". The nature of the first bilaterian is a matter of debate. One side...
cord. It has been suggested that the hindbrain first evolved in the urbilaterian—the last common ancestor of chordates and arthropods—between 570 and...
layers (ecto- and endoderm). Photoreceptive eye-spots evolve. 650-600 Ma Urbilaterian: the last common ancestor of xenacoelomorphs, protostomes (including...
S2CID 4366885. Lichtneckert R, Reichert H (May 2005). "Insights into the urbilaterian brain: conserved genetic patterning mechanisms in insect and vertebrate...
wormlike ancestor that lived around 600 million years ago, called the urbilaterian. A bilaterian animal is one that has symmetrical left and right body...
Mark Q. (2008-04-27). "Acoel development supports a simple planula-like urbilaterian". Philosophical Transactions of the Royal Society B: Biological Sciences...
photo-sensitive proteins and fall into nine groups, which already existed in the urbilaterian, the last common ancestor of all bilaterally symmetrical animals. Additionally...
PMID 12070079. Lichtneckert R, Reichert H (May 2005). "Insights into the urbilaterian brain: conserved genetic patterning mechanisms in insect and vertebrate...
developmental biology. It is believed that thyroid hormones evolved in the Urbilaterian well before the development of the thyroid itself and molluscs, echinoderms...
Martindale (2008). "Acoel development supports a simple planula-like urbilaterian". Philosophical Transactions of the Royal Society B. 363 (1496): 1493–1501...
treats". The first chapter introduces "the first two-sided animal", the urbilaterian which lived some 600 million years ago. Held calls the discovery that...
interpret the anatomy of Dickinsonia as indicative of its affinity to the urbilaterian. Evidence indicative of the impact of oxygen expansion driven by sea-level...
rhabdomeric opsins of invertebrates. Therefore, it is thought that the urbilaterian, the last common ancestor of mollusks, arthropods, and vertebrates already...
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