I will add photos, but I was hoping this one might be identifiable on description alone.
The mandarin was sold as a 'tangerine' at a local Japanese market, price 2.99/lb.
The shape is round nearly spherical, the skin is quite thick for a mandarin, and adheres well. The skin is leathery and deep orange/red. The oil glands leave the surface rough and pebbled. There is some pith. Some fruit showed what appeared to be a navel. I purchased it thinking it was supernova, just super late.
The aroma is tropical and striking. the flesh is soft and juicy. The pith is unfortunately quite bitter in the realm of grapefruit. The juice was somewhat sweet while being quite tart.
The fruit is seedless and had 10 segments.
Any ideas? I love the flavor, but hate the bitter taste. Might be worth soaking the peeled fruit in water to try to remove the bitterness.