Following the appearance of the neocortex some 250,000 years in our past, Homo sapiens evolved as the only species on planet Earth that created sophisticated technology from the clock to the radio and the quantum computer. In Apeman to Spaceman, the BBC reported that about two million years ago, something extraordinary started happening in […]
Journalists Bryn Nelson and Jane C. Hu talk about how the climate crisis means we could see more deadly outbreaks.
Despite being among the largest turtles that ever lived, the biology and systematics of Stupendemys geographicus remain largely unknown because of scant, fragmentary finds. We describe exceptional specimens and new localities of S. geographicus from the Miocene of Venezuela and Colombia. We document the largest shell reported for any extant or extinct turtle, with a carapace length of 2.40 m and estimated mass of 1.145 kg, almost 100 times the size of its closest living relative, the Amazon river turtle Peltocephalus dumerilianus , and twice that of the largest extant turtle, the marine leatherback Dermochelys coriacea . The new specimens greatly increase knowledge of the biology and evolution of this iconic species. Our findings suggest the existence of a single giant turtle species across the northern Neotropics, but with two shell morphotypes, suggestive of sexual dimorphism. Bite marks and punctured bones indicate interactions with large caimans that also inhabited the northern Neotropics.
Source: The origin and evolution of love