The fossil , named after paleontological curator Dr. Betsy Nicholls , originally was named Nichollsia borealis .
Nichollsia was already in use ( preoccupied ) by a genus of isopods .
The fossil , named after paleontological curator Dr. Betsy Nicholls , originally was named Nichollsia borealis but Nichollsia was already in use ( preoccupied ) by a genus of isopods .