Nikita Gross is credited but only three actresses appear and Nikita is absent.
A contributor to VEF writes: "I found ... Italian copy of Tarzan X that was 2h16m in length. The last portion of that film was Tarzhard... D'Amato apparently assembled Tarzhard out of footage he shot but didn't use in the original release". This seems entirely reasonable - and is supported by the reuse, in a garbled form, of earlier d'Amato credits (Swetta Silvestru/Serena Silvestri; Barbara Dobson/B Dobici; Cinzia Raffaeli/Cintya Raffaell). There is considerable crossover with the respective scenes in Tharzan, including Tina's abortive anal.