Pictures: Oldest Dinosaur Embryos Show"Big Surprises"

The sharpest look yet at the oldest known dinosaur embryos (pictured, one of the eggs and its inhabitant) has revealed some"big surprises,"a scientist says.

For one thing, the 190-million-year-old babies ofMassospondylus—a two-legged dinosaur that preceded the well-known sauropods, such asDiplodocus—do not resemble their parents, according to study co-authorHans-Dieter Sues, a paleontologist at the National Museum of Natural History in Washington, D.C. (See more dinosaur-embryo pictures.)

The 8-inch-long (20-centimeter-long) youngster, for example, had long front legs for walking on all fours, and its overall body proportion—such as a short snout—made it"look like a dwarf version of a sauropod dinosaur,"the largest animals to walk Earth. (See a sauropod picture.) The babies would have lost these traits as they matured.

The discovery suggestsMassospondylushad characteristics that"foreshadowed"the later look of the sauropods, he said. (See"New Strong-Handed Dinosaur May Shatter Assumptions.")

—Christine Dell'Amore

The oldest-dinosaur-embryo research appears in the November issue of theJournal of Vertebrate Paleontology.

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