I think i have to disagree with sphelps. I dont think you can call anything whatever you want. The jewellery trade is a good example of this, for example you can trade stuff like Herkimers Diamonds, but on legal document its just going to be Quartz. If you put it down on an appraisal as a diamond, you could be sued.
In the case of the clams, I think they shouldve just gave it some new grade. They could make up a new grade above ultra.

Nicest clam I've ever seen. I'd love to have something like that!

Kind of a moo point since it's a completely different industry, wouldn't you say? We don't require verified species and documentation when we by from stores. The point is it looks like a hybrid because of the ridges, that's all. I don't think anyone provided any documentation verifying it was a new species. It's just a name like all rare corals and inverts tend to develop. If I was marketing this clam I would come up with something better than new ultra grade, hybrid fits. It's just a description for a clam, it means nothing, either way the price will be outrageous.