Estimates vary, but in terms of extinct nonavian dinosaurs, such as Tyrannosaurus rex, about 300 valid genera and roughly 700 valid species have been discovered and named. However, given that the fossil record is incomplete, in the sense that we've yet to discover fossils of many other kinds of dinosaurs that no doubt did exist, the stated numbers almost certainly do not reflect the true diversity of extinct dinosaurs.
One reason for this incompleteness of the fossil record is that rocks for some geologic time periods are not very commonly found on the surface for us to collect. For example, many more kinds of Late Cretaceous dinosaurs are known than Middle Jurassic dinosaurs because outcrops of Late Cretaceous are more numerous and more widely spread geographically than those of Middle Jurassic age.
But in reality, the number of known extinct dinosaurs pales in comparison to the number of dinosaurs living today! This is because birds are actually a group of living dinosaurs, since evolutionary analyses document that birds evolved from some species of small carnivorous dinosaur similar to Velociraptor. (See: Are there any dinosaurs alive today?) Again estimates vary, but there are at least 10,000 species of living birds, which again suggests that there are many more species of extinct dinosaurs yet to be discovered.
This video is part of a series, "Dinosaurs Explained," produced by the American Museum of Natural History. In the series, Museum paleontologists answer the most frequently asked questions about dinosaurs.
To watch the videos, go to www.amnh.org/explore/amnh-tv. Click on the "Dinosaurs Explained" Tab on the left side of the page. In the playlist, start with the first question and play each video consecutively for a mini-course in dinosaur fossils.
Episode 1: What Is and Is Not a Dinosaur?
http://youtu.be/Me8BrHY57JI
Episode 2: Who Discovered the First Dinosaur Fossils?
http://youtu.be/FbPGrB-BmH0
Episode 3: How Do Dinosaurs Get Their Names?
http://youtu.be/Wrdmw_Ioovk
Episode 4: Are Any Dinosaurs Still Alive Today?
http://youtu.be/947j2zXm8WA
Episode 5: How Many Kinds of Dinosaurs Are There?
http://youtu.be/xdGe2tMdjxs
Episode 6: Where in the World Did Dinosaurs Live?
http://youtu.be/0lGXGz_lALM
Episode 7: What Is the Earliest-Known Dinosaur?
http://youtu.be/62LK_Ny905o
Episode 8: What Were the Biggest and Smallest Dinosaurs?
http://youtu.be/Icp9eIVMBwU
Episode 9: What Did Dinosaurs Eat?
http://youtu.be/dYrNWPyLtlI
Episode 10: How Fast Were Dinosaurs?
http://youtu.be/GKsygFxt4XI
Episode 11: How Intelligent were Dinosaurs?
http://youtu.be/pXFHtwVQxqk
Episode 12: Did Dinosaurs Fight?
http://youtu.be/hiqlCBH-5C0
Episode 13: How Did Dinosaurs Reproduce?
http://youtu.be/Kp4Dg8XBeUA
Episode 14: Did Dinosaurs Travel in Herds or Packs?
http://youtu.be/jtbpusl0Vo0
Episode 15: What Was Dinosaur Skin Like?
http://youtu.be/6i3EmBNYptk
Episode 16: How Fast Did Dinosaurs Grow, and How Long Did They Live?
http://youtu.be/KyUptMWcmZI
Episode 17: What Color Were Extinct Dinosaurs?
http://youtu.be/bN7XTFlxPTI
Episode 18: Were Dinosaurs Warm-Blooded?
http://youtu.be/oy8Kvt1vOto
Episode 19: How Did All Dinosaurs Except Birds Go Extinct?
http://youtu.be/mCKeogDioWE
Episode 20: Can We Clone Extinct Dinosaurs From DNA Preserved in Their Fossils?
http://youtu.be/H1E_Nwj2dro
Episode 21: What Is a Fossil?
http://youtu.be/WWHJqnfmhQ8
Episode 22: How Do We Know Where to Look for Dinosaur Fossils?
http://youtu.be/XQRZqG7wCPQ
Episode 23: How Are Dinosaur Fossils Discovered and Collected?
http://youtu.be/rYjs8Wtfnzo
Episode 24: How Are Dinosaur Fossils Prepared in the Laboratory?
http://youtu.be/6brUGBR6ll0
Episode 25: How are skeletal mounts of dinosaurs in museum exhibits built?
http://youtu.be/FZNq4SgUqgE
Episode 26: Where are all the dinosaur fossils kept once they're prepared?
http://youtu.be/r8ENj3lTTWk
Episode 27: How Do We Know Which Kind of Dinosaurs Were Most Closely Related?
http://youtu.be/3gNw_6DoVc8
Episode 28: How do we know how long ago dinosaurs lived?
http://youtu.be/6pYPqtdTnrM
Episode 29: In what kind of environments did dinosaurs live?
http://youtu.be/62Z-iSwh3i4
Episode 30: How does studying dinosaurs benefit humanity?
http://youtu.be/vGzVaprEbqs
***
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