Here’s the thread I was thinking of:
https://forum.inaturalist.org/t/common-name-being-deleted-mardi-gras-sharpshooter/12137/31
But it turns out there are additional threads:
https://forum.inaturalist.org/t/list-of-sources-for-common-names-wiki/10249
https://forum.inaturalist.org/t/reliable-sources-for-common-names-on-inaturalist/5579/11