Sorry, I wrote that down in a misleading way. Afro/Cuban might have been better, but what I really meant was "rhythmic structures influenced by African and/or Cuban musical culture", which samba definitely was. That's redundant in a way, because Cuban forms themselves are deeply indebted (if not directly playing) African forms, but my understanding is that there was a particular development/expansion of things in Cuba (much as in Brasil) that is perhaps best understood as a new branch of the tree. Samba doesn't owe anything in particular to Cuban traditions, but does draw on other African percussive structures.