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[dinosaur] Number of theropod individuals per species

Good day,

in the book "The Complete T. rex" from 1993 Don Lessem and Jack Horner state, that 85 % of then known theropod species is known only from 1 to 5 specimen and that almost 50 % of known species is known from a single specimen. I would like to ask how does this situation changed (if it changed) in the course of almost 25 years from the publication of the book? Thank you, in advance. Tom