Paleontology

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Hallucigenia sparsa, illustrated

OUT OF A DREAM  Hallucigenia sparsa (illustrated) finally has a head, thanks to a new analysis of fossils.

drawing of gigantic dinosaur Dreadnoughtus schrani

SIZE CHECK  The gigantic dinosaur Dreadnoughtus schrani may not have weighed as much as scientists thought. A new analysis of bone volume puts the dino’s weight at as little as 22,000 kilograms.

traces of dino blood

DRIED BLOOD  A scanning electron micrograph of a sliver of a theropod’s toe claw reveals oval-like structures that resemble the red blood cells seen in living birds. The colors correlate to density: less dense, carbon-based material appears red and denser mineralized material appears green.

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