The discovery of 280-million-year-old reptile embryos in Brazil and Uruguay has provided paleontologists with the oldest known fossil evidence of amniote embryos. The remains, linked to the aquatic ...
An international team of paleontologists has uncovered the oldest known fossil reptile embryos, dating back approximately 280 million years. This discovery, featuring well-preserved embryos of ...
Examples of severe malformations caused by thermal stress. The white scale bars equal 1cm. Top left: an embryo with exencephaly and caudal torsion; top right: embryo with severe axial deformation and ...