The mislabeling of Polypterids is widely-spread ... in Germany there's the same situation.
Most aquaristic books are mislabeling bichirs for decades! The dealer who wants to know anything about the fish he get, have to assume this thrash. I've seen Palmas declared as Ansorgii, Polli declared as Palmas (THE most popular mislabeling!) ... in books!
No wonder - in the pet-shop you will see the result of bad investigation done by writers who are resistent against knowledge ...