The original Bonaparte 1991 description of Alvarezsaurus calvoi is not online in any easily accessible place. There are a number of early 1990's taxa that are missing their initial descriptions online, so this is not an important distinction. That description makes the video from yesterday impossible as it describes a dinosaur from up to 83 million years ago whereas Saltasaurus comes from rocks dating to approximately 78 million years ago. Despite that trouble, the description has been used over and again in describing other members of the alvarezauridae such as Albertonykus and Achillesaurus. STL Science Center
06 September 2016
Not Online
The original Bonaparte 1991 description of Alvarezsaurus calvoi is not online in any easily accessible place. There are a number of early 1990's taxa that are missing their initial descriptions online, so this is not an important distinction. That description makes the video from yesterday impossible as it describes a dinosaur from up to 83 million years ago whereas Saltasaurus comes from rocks dating to approximately 78 million years ago. Despite that trouble, the description has been used over and again in describing other members of the alvarezauridae such as Albertonykus and Achillesaurus. 
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