The basis for reinstating Ilyanassa is Puillandre et al. (2021): https://onlinelibrary.wiley.com/doi/10.1111/zsc.12489. I used Ilyanassa for many years, but I've gotten used to Tritia. If we reinstate Ilyanassa in iNat for Western Atlantic species, we have to do it for Ilyanassa obsoleta as well. There are also some fossil species, but I don't think any of them are in iNat.

I have to say, I intensely dislike how iNat does taxon swaps. It should just show the current name next to the name used when the observation was made. Instead, the changed name is added as another observation, disregarding that it might have been refined or contradicted by subsequent identifications.