line is just placed in front of the known morph, lemon pastel, blonde pastel, ect. but their all pastels. personaly I don't see the point of all the lines and just see it as a marketing tool, but in reality means nothing.
call it *insert name here* yellowbelly if you want, but truth be told it will most likly annoy people. if you go to sell anything, give them your little story you just posted, with proof, and leave it at that, but just call them yellowbellies.