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ett särskilt problem när det gäller den zoologiska klassificeringen av arterna var att gibboner (hylobates hoolock, h. lar, h. syndactylus, etc.) i vissa klassificeringssystem placeras i familjen hylobatidae som vissa biologer anser inte ens ingår i anthropoidea.
a particular problem concerning the zoological classification of the species was encountered : some classification systems place the gibbons (hylobates hoolock, h. lar, h. syndactylies, etc.) in the separate family of the hylobatidae, which some naturalist would even exclude from the anthropoi'dea.