(jm): Clementina Rubino do not have red pulp. You have to take names in some citrus shops in Europe with caution .
I know only 2 mandarins with red pulp, first one - is tangerine cv. Sanguigno (Trabut) and second one is hybrid AMOA 8 (Moro x Avana). I have the second one, so I can not compare, but there is also possibility, that AMOA 8 and Trabut is the same variety with different names.
http://www.citrusvariety.ucr.edu/citrus/amoa8.html

I am certainly convinced. Thanks for the additional links/pictures Lazz and Radoslav.

Ned

Hi Radoslav
I know that there is a regular clementine named rubino and cultivated in spain. But this cultivar is named rubino too by tintori nursery in Italy.

Ned, I don't know how to change the color in a photo : I am a too bad user of photoshop !!!
It's the real color of the fruit of my tree.

http://www.florealia.com/DetailProduct.aspx?ID=3510
I have this cultivar