This paper presents a phonological analysis of progressive C1 and plural/pluractional C1C2 reduplication in Comox-Sliammon (Salish) within the Generalized Nonlinear Affixation framework. Specifically, this paper shows that the inventory of prosodic categories must be expanded to account for monomoraic syllables with non-moraic nuclei. In order to derive an open monomoraic syllable for progressive reduplication and a closed monomoraic syllable for plural/pluractional reduplication, the underlying representation of the plural/pluractional reduplication must be an affixed syllable with both a nucleus node and a mora. More broadly, this paper provides empirical evidence for the inclusion of the nucleus as a unit in prosodic structure to account for closed monomoraic syllables, which are common in Salish languages.