Original Dating lock & key parties are one of the most fun ways to meet a large number of people in one night.These are some of the largest dating events anywhere and our success has been built around them - if you want to meet people, lock & key parties are for you.In general, the uncorrelated model yielded substantially wider Cr Is, sometimes with ranges of hundreds of millions of years (e.g., Calcarea, Demospongiae).Under both models however, Metazoa and its deepest subclades – Porifera, Epitheliozoa (Placozoa Eumetazoa), Eumetazoa (Coelenterata [=Cnidaria Ctenophora] Bilateria), and total-group Bilateria – as well as the crown-groups of Coelenterata, Cnidaria, Porifera, Silicea (siliceous sponges), and Calcarea homoscleromorph sponges were estimated to have arisen before the Sturtian glaciation (the first of the Neoproterozoic Snowball Earth episodes). Dotted line indicates Precambrian/Cambrian boundary. Gray areas indicate Sturtian (left) and Marinoan (right) glaciations For the deepest nodes (Opisthokonta to Eumetazoa), all three calibration sets resulted in pre-Sturtian age estimates, with C yielding the oldest, A the youngest, and B intermediate estimates (Fig. The same pattern was also obtained for the crown groups of Coelenterata, Cnidaria, Porifera, and Calcarea Homoscleromorpha.
According to our results, all non-bilaterian phyla, as well as total-group Bilateria, evolved in an ancient radiation during a geologically relatively short time span, before the onset of long-term global glaciations (“Snowball Earth”; ~720–635 Ma).
Given that the autocorrelated model had a better fit according to preliminary model selection analyses (see Supplementary Material) and yielded younger – i.e., in better agreement with the fossil record – and more precise age estimates for most nodes, we did not consider the uncorrelated model further. For crown Bilateria, Protostomia, and Deuterostomia, the ranking was the same, but estimates fell within the Sturtian, Marinoan, or interglacial intervals under A and B.
Age estimates for major animal groups obtained under different molecular clock models. Under A and B, Cr Is for crown Medusozoa spanned the general glaciation interval, with means falling within or close to the interglacial period.
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