Dating party animal
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Although molecular clock studies have generally supported a deep pre-Ediacaran origin of animals and many of its major subgroups.
Moreover, the majority of studies have focused either on estimating the timescale of eukaryote evolution and thus including only few animals as representatives of just one lineage within the Opisthokonta supergroup included a variety of non-bilaterians – 20 sponges, Trichoplax, and six cnidarians.
Information about the geological timeframe during which animals radiated into their major subclades is crucial to understanding early animal ecology and evolution.
Unfortunately, the pre-Cambrian fossil record is sparse and its interpretation controversial.
Importantly, this result appears robust to alterations of a number of important analytical variables, such as models of among-lineage rate variation and sets of fossil calibrations used.