A new study by researchers at the University of Nottingham has shed light on the complexity of our ancient ancestors, solving an important piece of the animal evolution puzzle. A new study by researchers at the University of Nottingham has revealed that our ancient ancestors were more complex tha
The study also provides increased, but not conclusive, support for the existence of Xenambulacraria.
In the distant past, animals underwent a significant evolution by developing bilateral symmetry and two gut openings. This allowed them to move faster through the early seas, find food and extract nutrients more efficiently, and protect themselves from predators. The success of this trait can be seen in the diverse range of animals that still possess bilateral symmetry and two gut openings today, including humans, starfish, sea cucumbers, elephants, crickets, and snails.
However, a research team, led by Dr. Mary O’Connell at the University of Nottingham has found that Xenacoelomorphs branch much later in time. They are not the earliest branch on the bilaterian family tree and their closest relatives are far more complex animals, like starfish. This means that Xenacoelomorphs have lost many of the complex features of their closest relatives, challenging the idea that evolution leads to ever more complex and intricate forms.
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