Dear Andy;-
     I don't know anymore about Scaphella than I do about quantum
mechanics. I agree that if you have hybrids, the hybrid-ing species
(parents) should be nearby. In their absence, some other designation
should be used-----up to and including "species". Quite some time ago,
 Tigers and Lions were interbred to produce Ligers and Tiglions. I
haven't heard of them breeding at all.
               Art