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We study spectral features in the gamma-ray emission from dark matter (DM)annihilation in the Next-to-Minimal Supersymmetric Standard Model (NMSSM), witheither neutralino or right-handed (RH) sneutrino DM. We perform a series ofscans over the NMSSM parameter space, compute the DM annihilation cross sectioninto two photons and the contribution of box-shaped features, and compare themwith the limits derived from the Fermi-LAT search for gamma-ray lines using thelatest Pass 8 data. We implement the LHC bounds on the Higgs sector and on themasses of supersymmetric particles as well as the constraints on low-energyobservables. We also consider the recent upper limits from the Fermi-LATsatellite on the continuum gamma-ray emission from dwarf spheroidal galaxies(dSphs). We show that in the case of the RH sneutrino the constraint ongamma-ray spectral features can be more stringent than the dSph bounds. This isdue to the Breit-Wigner enhancement near the ubiquitous resonances with a CPeven Higgs and the contribution of scalar and pseudoscalar Higgs final statesto box-shaped features. By contrast, for neutralino DM, the di-photon finalstate is only enhanced in the resonance with a $Z$ boson and box-shapedfeatures are even more suppressed. Therefore, the observation of spectralfeatures could constitute a discriminating factor between both models. Inaddition, we compare our results with direct DM searches, including theSuperCDMS and LUX limits on the elastic DM-nucleus scattering cross section andshow that some of these scenarios would be accessible to next generationexperiments. Thus, our findings strengthen the idea of complementarity amongdistinct DM search strategies.

Enhanced lines and box-shaped features in the gamma-ray spectrum from annihilating dark matter in the NMSSM