What is tatisaurus?

As an AI language model, I did not find any credible reference to a dinosaur species named Tatisaurus. There is no record of any dinosaur species with this name in the scientific literature or in any reputable databases or archives. Therefore, it is possible that Tatisaurus is an unrecognized or unclassified dinosaur species or a misidentified specimen that requires further study and verification. Without adequate scientific evidence, any information about Tatisaurus should be considered speculative and unreliable.