An article published in the journal “Nature” describes a new hypothesis regarding the relationships within the group of dinosaurs. A team of scientists from the British Cambridge University and the Natural History Museum in London proposed a new structure for the tree of the dinosaur group that heavily restructures the classical groups by assigning a number of new names as well. The scientists also proposed the hypothesis that dinosaurs originated in the northern hemisphere and not in the southern.

An article published in the journal “American Museum Novitates” describes a research that provides the strongest evidence yet that sharks descended from a very ancient group of fish called acanthodians. A team of researchers led by John Maisey of American Museum of Natural History’s Division of Paleontology analyzed fossil remains that were exceptionally preserved of an ancient shark-like fish called Doliodus problematicus identifying it as a transitional species between acanthodians and sharks.