It is impossible to tell how many species of dinosaurs there were; new species are found each year. Approximately 700 species have been named as of 2007, and these species are placed in about 300 valid dinosaur genera, although about 550 have been named. Most dinosaur genera presently contain only one species (for example, Deinonychus) but some have more (for example, Iguanodon). Even if all of the roughly 700 published species are valid, their number is still less than one-tenth the number of currently known living bird species, less than one-fifth the number of currently known mammal species, and less than one-third the number of currently known spider species, which shows how much more there is to discover in the realm of paleontology.
First answer by MasgudenATZA. Last edit by MasgudenATZA. Contributor trust: 75 [recommend contributor]. Question popularity: 15 [recommend question]
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