I think it's awesome looking. We've seen how the Tessera gene affects belly pattern- everything from plain bellies, checkered to checkers pushed to the sides forming thin stripes. I think this is just the EXTREME version of how the gene can affect it.
This animal was produced from a TESSERA x TESSERA breeding. To date I know of only 2 other Tessera X Tessera breedings (one KJ & I did year before last and one breeding by Don Soderberg). Although we didn't see any blackbellies, our result observations only covered those two litters.
I didn't do any Tessera X Tessera breedings this season- kinda wish I did- would love to produce a blackbelly Tessera!!!! I'm sure over the next few seasons we'll see these popping up with all the upcoming Tessera morphs projects!
AWESOME ANIMAL!