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For a start, I have removed the stub tags from the article and the talk page.
I will come back to the lead a bit later, but the Taxonomy section is a bit confusing. The first sentence is about this species and then adds information on extant relatives, and the second sentence goes back to other fossil members of the family, and the next sentence returns to this species.
Looking back now at the lead, it is a fair summary of the article and a reasonable length seeing that it is a short article, but I think it should be rounded off by mentioning the likely cause of extinction.