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East Tukano languages are known for their developed nominal classification systems. Wa’ikhana (Piratapuyo) is in this sense a typical member of the family, since it has an open system with a large number of classes and with class markers which exercise derivational and agreement functions. Among all the Wa’ikhana inanimate classes, the class ‘round’ stands out for its semantic and morphosyntactic features. It is one of the most (if not the most) extensive classes, which includes round objects as well as objects of less prototypical shapes. Its markers in non-plural number have the biggest number of allomorphs, even though allomorphy of classifiers is not typical for this language. Besides, the class ‘round’ has a distinct plural marker, another feature absent from most classifiers. Comparison between Wa’ikhana and other related languages demonstrates that these peculiarities are shared by many East Tukano languages. Thus, the present paper aims to describe the class ‘round’ in Wa’ikhana and other languages of the family, and to show their common features as well as the features that distinguish Wa’ikhana.