In the HTML code of an Observations page on iNaturalist it would show as such currently (providing the observer made only 1 initial ID suggestion). Note the number 1 in: “1 identification”:
But theoretically, it could also be 2 instead of 1, but the goal if to filter based on observations with ID suggestions made by the observer only (that is: where no other iNaturalist user has ever made any other ID suggestion formally).
I am not sure if iNaturalist provides a GUI way to show only such observations, for a particular user?
As far as I know, the iNaturalist API does not allow people to search or sort the observations by the number of identifications.
I created a site to explore iNat data. I added a beta feature to show observations with one identification where the observer and identifier are the same person. It’s a hacky feature. Other stuff on the site such as counts, pagination, maps are not accurate.
search for “identifier”. type in user name.
click “Filters” button, " Beta Features" tab
click “Show observations with only one identification made by the observer”
there is no GUI for this. there is no server-side filter for this in the API. you’d have to download a set of observations via the API and then use your own client-side filter within that larger set.
depending on what exactly you’re trying to do, it may or may not be practical to do. (basically, it’ll depend on how big that larger set of observations is.)