ID please

Picked this up at Plano Pets over the weekend while they were having an impromptu 20% off sale. No one knew what it was but it was nice and big (about 7" diameter) and only ended up costing $30 so I figured I couldn't lose. Don't have a pic of the underside but it seems to have a skeleton kinda like a chalice. I thought it was an autralomussa but I see now those seem to be much smoother with patterns that almost look painted on. This thing is a little bumpier but not fleshy at all. Any ideas?
 
If it really is an austrolamussa, I almost feel like one of those folks in the antiques roadshow as all the austrilamussas I've seen online (even really plain ones) have been ridiculously expensive.
 
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