Pikaia gracilens, the earliest known human ancestor. Fossils from the Burgess Shale Formation dating back 505 million years preserve animals which are the oldest life forms ever discovered with primitive spinal cords. As the precursor of vertebrates the species is also believed to be the direct ancestor of all members of the chordate family, which includes fish, birds, reptiles, amphibians and mammals
Earliest known bird nestling which has dinosaur-like skull and teeth. It was found in Spain's Pyrenees and later fixed in synthetic resin. The bones of the 1 35-million-year-old fossil bear microscopic pits like those of modern juvenile birds
A new fossil discovery, named Heteronectes (meaning 'different swimmer'), was found in 50 million year old marine rocks from northern Italy. This study provides the first detailed description of a primitive flatfish, revealing that the migrated eye had not yet crossed to the opposite side of the skull in early members of this group.
Rare Insect Fossil Reveals 100 Million Years of Evolutionary Stasis...Researchers have discovered the 100 million-year-old ancestor of a group of large, carnivorous, cricket-like insects that still live today in southern Asia, northern Indochina and Africa. The new find, in a limestone fossil bed in northeastern Brazil, corrects the mistaken classification of another fossil of this type and reveals that the genus has undergone very little evolutionary change since the Early Cretaceous Period.