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COVER A reconstruction of Hadrocodium wui, an Early Jurassic fossil (about 195 million years old) found in Yunnan, China. This newly described mammaliaform is an extinct close relative of living mammals, with many advanced features despite its early age. On the basis of a subadult skull, the tiny insectivore is estimated to weigh approximately 2 grams. The reconstruction of this mammal is shown in comparison to a paper clip (32 millimeters). 1089 [Reconstruction artwork: Mark A. Klingler/Carnegie Museum of Natural History]

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Science. ISSN 0036-8075 (print), 1095-9203 (online)