Sponges Not Jellies Are the Oldest Animals
Which came first – the sponges or the comb jellies? The consensus view among taxonomists has long been that the sponges (Porifera) represent the oldest surviving animal phylum. However, recent studies of their genomes have suggested that this title rightly belongs to the comb jellies (Ctenophora). The issue has become one of the most hotly debated problems in evolutionary biology, because the answer has profound implications for our understanding of the entire history of animal evolution.
Source: G. Wörheide
All biologists accept that sponges and comb jellies are very ancient groups, which emerged more than 600 million years ago. Sponges are comparatively simple multicellular organisms, which lack clearly defined tissues, such as muscles, and organs like the brain. Comb jellies are structurally much more complex. They use so-called cilia to propel themselves through the oceans, and they possess nerve cells and muscle cells.
Credit: University of Bristol
In order to elucidate the genetic relationships between animal phyla, biologists compare the amino acid sequences of modern species with one another, and construct family trees based on the degree of difference between them. The most likely phylogenomic tree should then faithfully reflect the order in which the different phyla diverged from their common ancestor and from each other.
Contacts and sources:
Roberto Feuda, Martin Dohrmann, Walker Pett, Hervé Philippe, Omar Rota-Stabelli, Nicolas Lartillot, Gert Wörheide and Davide Pisani
Current Biology 2017
https://doi.org/10.1016/j.cub.2017.11.008
www.cell.com/current-biology/fulltext/S0960-9822(17)31453-7
Source: http://www.ineffableisland.com/2017/12/sponges-not-jellies-are-oldest-animals.html
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Nope, all wrong. This is where they All came from. http://itshisstory.com/evolution.html