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- Urbilaterian abstract "The urbilaterian (< German ur- 'original') is the hypothetical last common ancestor of the bilaterian clade, i.e., all animals having a bilateral symmetry.Its appearance is a matter of debate, for no representative has been (or is ever likely to be) identified in the fossil record; the reconstructed morphology it would display largely depends on whether the acoelomorpha are included within the bilaterian clade. Since all protostomes and deuterostomes share features, such as blood circulation systems and guts, that are only useful in relatively large (macroscopic) organisms, their common ancestor ought also to have been macroscopic. However, such large animals should have left traces in the sediment in which they moved, and evidence of such traces first appear relatively late in the fossil record — long after the urbilaterian would have lived. This leads to suggestions of a small urbilaterian, which is the supposed state of the ancestor of protostomes, deuterostomes and acoelomorphs.".
- Urbilaterian wikiPageID "19467882".
- Urbilaterian wikiPageRevisionID "597293852".
- Urbilaterian hasPhotoCollection Urbilaterian.
- Urbilaterian title "Phylogenetic position of the urbilaterian".
- Urbilaterian subject Category:Animals.
- Urbilaterian type Animal100015388.
- Urbilaterian type Animals.
- Urbilaterian type LivingThing100004258.
- Urbilaterian type Object100002684.
- Urbilaterian type Organism100004475.
- Urbilaterian type PhysicalEntity100001930.
- Urbilaterian type Whole100003553.
- Urbilaterian comment "The urbilaterian (< German ur- 'original') is the hypothetical last common ancestor of the bilaterian clade, i.e., all animals having a bilateral symmetry.Its appearance is a matter of debate, for no representative has been (or is ever likely to be) identified in the fossil record; the reconstructed morphology it would display largely depends on whether the acoelomorpha are included within the bilaterian clade.".
- Urbilaterian label "Urbilaterian".
- Urbilaterian sameAs m.04mwvj4.
- Urbilaterian sameAs Q7900273.
- Urbilaterian sameAs Q7900273.
- Urbilaterian sameAs Urbilaterian.
- Urbilaterian wasDerivedFrom Urbilaterian?oldid=597293852.
- Urbilaterian isPrimaryTopicOf Urbilaterian.