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Alles weergeven op WikipediaUrmetazoan - Wikipedia
The Urmetazoan is the hypothetical last common ancestor of all animals, or metazoans. It is universally accepted to be a multicellular heterotroph — with the novelties of a germline and oogamy, an extracellular matrix (ECM) and basement membrane, cell-cell and cell-ECM adhesions and signaling … Meer weergeven
All animals are posited to have evolved from a flagellated eukaryote. Their closest known living relatives are the choanoflagellates, collared flagellates whose cell morphology is similar to the choanocyte … Meer weergeven
• Biota (Taxonomicon)
• Life (Systema Naturae 2000)
• Vitae (BioLib)
• Meer weergevenSeveral different hypotheses for the animals' last common ancestor have been suggested.
• The placula hypothesis, proposed by Otto Bütschli Meer weergeven• Evolution of nervous systems – Origin and subsequent variation and development of neurons and neural tissues and … Meer weergeven
Wikipedia-tekst onder CC-BY-SA-licensie Mesozoa - Wikipedia
WEBMesozoa. The Mesozoa are minuscule, worm -like parasites of marine invertebrates. Generally, these tiny, elusive creatures consist of a somatoderm (outer layer) of ciliated cells surrounding one or more reproductive cells. A 2017 study recovered Mesozoa as a monophyletic group that emerged in the Lophotrochozoa as sister of the Rouphozoa. [1]
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The origin of Metazoa: a unicellular perspective - Nature
WEB8 mei 2017 · The origin of Metazoa: a unicellular perspective. Arnau Sebé‐Pedrós1, Bernard M. Degnan2 and Iñaki Ruiz‐Trillo3–5. Abstract | The first animals evolved from an unknown single-celled ancestor in...
The origin of Metazoa: a unicellular perspective - Nature
WEB8 mei 2017 · Key Points. The origin of animal multicellularity is one of the major evolutionary transitions in the history of life. The identification and phylogenetic classification of the closest unicellular...
Evolutionary transcriptomics of metazoan biphasic life …
WEB16 mrt. 2020 · The transient larva-bearing biphasic life cycle is the hallmark of many metazoan phyla, but how metazoan larvae originated remains a major enigma in animal evolution.
Origins of the Metazoa | SpringerLink
WEBMetazoan diversity has universal origins that lie in, or even prior to, the Cryogenian 635–850 MYA, with a watershed in metazoan evolution recognized as being in the early Cambrian (542 MYA) by which time most modern, and now extinct, metazoan body plans had been established.
Metazoa | animal | Britannica
WEB…origin of multicellular animals (metazoans) was long dominated by German embryologist Ernst Haeckel’s theory that the original metazoan ancestor was a spherical protozoan that was structurally similar to the cnidarians (e.g., jellyfish and corals). Currently there are two alternative explanations. The first traces metazoans back to Read More
The rhizome of life: what about metazoa? - PMC - National Center …
WEB11 apr. 2012 · Therefore, in the light of such genetic events, whether the evolution of metazoa exists in the form of a tree, network or rhizome is highly questionable and needs to be determined. In the current review, we will focus on the role of HGT, retrotransposons and hybridization in the metazoan evolution.
Early metazoan life: divergence, environment and …
WEB19 dec. 2015 · Metazoan body sizes increased significantly, first with the appearance of the Ediacaran macrofauna after 579 Ma, and then with the appearance of larger-bodied bilaterians in the early Cambrian. Both …
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