Search for observations that don't have a particular observation field

A few of us have been marking a certain species pair in the fields section and I was wondering if there was a way to search for observations that we haven’t hit. I know there’s an url to see what has been annotated, is there one to see what hasn’t?

Are you asking about observation fields or annotations (or both)? It seems like observation fields, but you also reference observations that have been annotated in your post. They function a bit differently, so this would impact potential answers.

This would be for observation fields. We’ve got the field: Species Group: vagans/sandersoni
https://www.inaturalist.org/observations?verifiable=any&place_id=any&field:Species%20group=vagans%2Fsandersoni

And I’d like to be able to search for observations that lack this field.

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Great, more duplicate fields. I made one for species groups in Perdita and Macrotera, so I should switch over to the one you’re using
https://www.inaturalist.org/observation_fields/15237