...my barbaric YAWP...
                                                                   "Song of Myself" Leaves of Grass
                                                Walt Whitman 
Deinonychus antirrhopus 
[Ostrom's discovery led to revival of the bird-dinosaur controversy - Deinonykus]
John Ostrom's study of Deinonychus antirrhopus led to the revival of the
dinosaur-bird controversy. AMNH, NY 2000
The terrible claw Deinonykus AMNH 2000  [ Deinonykus over the images of Archaeopteryx taking flight]

The specimen was first displayed in 1995, but collected in 1931 by a team headed by legendary dinosaur collector, Barnum Brown, (including Peter Kaisen). This mount of Deinonykus contains mostly real bones, unlike all other displays around the world. The bones were collected from the Cloverly formation, Buster Creek, Cashen Ranch, Crow Indian Reservation, Montana. The sediments date from the early Cretaceous, about 107 million years ago.

Barnum Brown called the specimen Daptosaurus but never published his work. It was a medium-sized theropod with hollow bones. In 1964, John Ostrom, of Yale University, investigated the Cloverly Formation and discovered a curved claw and then other bones. His investigations revealed similarities to avian (bird) morphology, especially in one of the wrist bones which had a half-moon shape (semi-lunate carpal). He named it Deinonychus antirrhopus, the terrible claw. The type specimen resides in the Peabody Museum, New Haven, Connecticut.

Deinonychus's terrible claw is on an extensible second toe (pedal ungual). Long boney extensions (prezygopophysis) on the caudal vertebrae kept the tail straight, counter-balancing the body. Similar features are present in Velociraptor and Bambiraptor. The extensible second toe found in Troodon exhibits anatomical differences from the previous dinosaurs, and is thought to represent convergence.

[Button link to dinosaurs site section - profile of STAN T. rex]  
Dinosaurs & 
[Button link to fish site section - gyotaku fish print of bluerunner] 
[Button link to parasites and microscopic site section - Amblyomma nymphs - ticks] 
[Button link to stamps site section - pen cancelled envelope from ARK] 
[Button link to Court of Bambiraptor - profile of Bambiraptor] 

All images ©Michael Patrick Corriss
August 2,2001
Images photographed with Olympus OM-1 35-mm camera, Olympus KHC microscope,
Ricoh RDC-300Z digital camera, scanned by Nikon LS-2000 and
manipulated with PhotoShopLE.
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