Evolution

Blogs about evolution

Mitochondria structure: 1 : inner membrane, 2 : outer membrane, 3 : Cristae, 4 : Matrix

An article published in the journal “Nature” describes a study that investigated a key moment in the evolution, when cells acquired mitochondria (image ©Wikigraphists of Atelier Graphique). Researchers Toni Gabaldón and Alexandros Pitis of the Centre for Genomic Regulation, an international institute for biomedical research based in Barcelona, ​​Spain, conducted a study whose conclusions suggest that the acquisition of mitochondria came late in the evolution of cells.

Ornithomimus skeleton at the Royal Ontario Museum

An article published in the journal “Cretaceous Research” describes the analysis of the fossilized remains of a skeleton of Ornithomimus, a dinosaur that lived in the late Cretaceous period, between 99.6 and 65.5 million years ago. This is the best example of this kind of dinosaurs found so far because the conservation of its feathers and skin is more extensive compared to the specimens previously found. Aaron van der Reest, the main author of the study, discovered these fossils in 2009 in the Dinosaur Provincial Park in Alberta, Canada.

It’s only been a few weeks since the announcement of the discovery of bones of Homo naledi, a new species related to modern humans. Found in a cave called Rising Star, about 50 km north-west of Johannesburg, South Africa, the bones have immediately been studied and two articles just published in the journal “Nature Communications” describes studies on the these hominids’ hands and feet.

An article recently published in the journal “Nature” describes the study of the DNA of hominids found in a place in northern Spain called Sima de los Huesos, which means pit of bones. The DNA analysis of these fossils of hominids who lived between 300,000 and 400,000 years ago established that they are an early form of Neanderthals. According to paleogeneticist Matthias Meyer of the Max Planck Institute for Evolutionary Anthropology in Leipzig, Germany, the results suggest that the ancestors of homo sapiens separated from those of the Neanderthals and another species called Denisovans between 550,000 and 765,000 years ago.

Part of the bones of the hominids called Homo naledi discovered in South Africa (Photo Lee Berger and colleagues)

An article published in the online magazine “eLife” describes the discovery of about 1,500 pieces of bones from at least 15 individuals in a cave called Rising Star about 50 kilometers northwest of Johannesburg, South Africa. According to the researchers, it’s a species related to humans unlike any known one they called Homo naledi. Another article will be published in the October issue of the magazine “National Geographic”. However, the classification of these fossils has already generated some controversy.