It appears to me that there is some issue with counting by software that may also explain why it may be so difficult to impossible to find the last remaining species.
I had just uploaded discoveries and noted that I had discovered 9/10 species. Shortly thereafter I stumbled across another undiscovered species, presumably the last, and scanned and uploaded that discovery. However, the software still reported 9/10 species discovered. When counting the actual species that had been uploaded, six are reported as having been discovered and uploaded on the first page and the second page shows four species discovered and uploaded.
Perhaps the ten-fingered count differently but in this case the total number of species discovered/reported and uploaded seems to add up to ten, not nine. Please feel free to check my math. I even checked the names of the uploaded species and there are no duplicates so I do indeed have ten unique species actually discovered/reported and uploaded. A restart did not correct this and I just gave up and moved on to another system or two.
Just passing this information along in case anyone else has encountered this. My experience with submitting bug or trouble reports has yet to elicit any acknowledgment, let alone a response, so I didn’t waste the electrons.