Pterodroma deserta split

We have been aware that a new work by Robb, M.S., Mullarney, K.M. & The Sound Approach 2008, Petrels Night and day: a Sound Approach Guide, Poole., splits Pterodroma feae deserta into Pterodroma deserta, based on vocalizations.A recent work by Frank Zino, Manuel Biscoito and Ruth Brown; The Separation of Pterodroma madeira (Zino’s Petrel) from Pterodroma feae (Fea’s Petrel). Here they mention that more research should be done with measurements of the Fea’s Petrel that Cape Verde, to conclude if they are a split.Now our question is “Who is the nominate species for P. deserta? Pterodroma mollis or Pterodroma feae