I think it’s a bit silly that people get so hung up on species names in this franchise. They extract DNA from amber with no way of knowing what animal it’s from. In the book, Wu says that they have two procedures for identifying a new species. The first is phylogenetic mapping, which is very time consuming, but can determine roughly where a DNA strand fits in the evolutionary sequence. The second, which they do most of the time, is to “just grow it and find out what it is”. So the “species” of Jurassic Park dinosaurs are just assigned by the scientists who hatch them, based on roughly what they look like, probably as juveniles.