Dino Day: Bonapartenykus ultimus

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The Bonapartenykus ultimus (“last claw of the paleontologist José Fernando Bonaparte”) came from the late Upper Cretaceous (Campanian, ca. 83.6–72.1 Ma) of western Gondwana (present-day Argentina). The only known specimen is a female that had two internal eggs called Arraigadoolithus patagonicus. Although it is not known precisely what their food source was, it has been suggested that some were either insectivores or omnivores. So it is not surprising that the largest alvarezsaurids were similar in size to today’s largest mammal insectivore, the yurumí (Myrmecophaga tridactyla), or giant anteater.

Many alvarezauroids are the smallest terrestrial theropods. Even the largest species do not stand out. Patagonykus puertai (“Patagonian claw, by Pablo Puerta”) from the early Upper Cretaceous and Achillesaurus manazzonei (“Achilles lizard of Rafael Manazzone”) from the late Upper Cretaceous, both from the western zone of Gondwana (present-day Argentina), were about 2.8 m long and weighed 30 kg. They were very close in size to Bonapartenykus ultimus, but it is unknown if they were adults. .

Dinosaur Facts and Figures: The Theropods and Other Dinosauriformes
By Rubén Molina-Pérez and Asier Larramendi
Illustrations byAndrey Atuchin and Sante Mazzei

The theropod dinosaurs ruled the planet for millions of years, with species ranging from the mighty Tyrannosaurus rex to feathered raptors no bigger than turkeys. Dinosaur Facts and Figures is a stunningly illustrated book of records for these marvelous creatures—such as the biggest, the smallest, and the fastest theropods, as well as the ones with the most powerful bite.

This one-of-a-kind compendium features more than 3,000 records, covers some 750 theropod species, and includes a wealth of illustrations ranging from diagrams and technical drawings to full-color reconstructions of specimens. The book is divided into sections that put numerous amazing theropod facts at your fingertips. “Comparing Species” is organized by taxonomic group and gives comparisons of the size of species, how long ago they lived, and when they were discovered. “Mesozoic Calendar” includes spreads showing the positions of the continents at different geological time periods and reconstructions of creatures from each period. “Prehistoric Puzzle” compares bones, teeth, and feathers while “Theropod Life” uses vivid, user-friendly graphics to answer questions such as which dinosaur was the smartest and which had the most powerful bite. Other sections chart theropod distribution on the contemporary world map, provide comprehensive illustrated listings of footprints, compile the physical specifications of all known theropods and Mesozoic birds, and much more.

  • The essential illustrated record book for anyone interested in dinosaurs
  • Features thousands of records on everything from the smartest and fastest theropods to the largest theropod eggs
  • Includes more than 2,000 diagrams and drawings and more than 300 digital reconstructions
  • Covers more than 750 theropod species, including Mesozoic birds and other dinosauromorphs
  • Provides detailed listings of footprints, biometric specifications, and scholarly and popular references
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