Flatworm with a home: An international research team led by Brown University has determined that the flatworm Acoelomorpha belongs as a sister clade to other bilateral animals.
When it comes to understanding a critical junction in animal evolution, some short, simple flatworms have been a real thorn in scientists’ sides. Specialists have jousted over the proper taxonomic placement of a group of worms called Acoelomorpha. This collection of worms, which comprises roughly 350 species, is part of a much larger group called bilateral animals, organisms that have symmetrical body forms, including humans, insects and worms. The question about acoelomorpha, was: Where do they fit in?
Continue reading… “First Evolutionary Branching For Bilateral Animals Found”