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We present the serendipitous discovery of a galaxy group in the XMM-LSS fieldwith MIGHTEE Early Science observations. Twenty galaxies are detected in HI inthis $z\sim0.044$ group, with a $3\sigma$ column density sensitivity of$N_\mathrm{HI} = 1.6\times10^{20}\,\mathrm{cm}^{-2}$. This group has not beenpreviously identified, despite residing in a well-studied extragalactic legacyfield. We present spatially-resolved HI total intensity and velocity maps foreach of the objects, which reveal environmental influence through disturbedmorphologies. The group has a dynamical mass of$\log_{10}(M_\mathrm{dyn}/\mathrm{M}_\odot) = 12.32$, and is unusuallygas-rich, with an HI-to-stellar mass ratio of$\log_{10}(f_\mathrm{HI}^\mathrm{*}) = -0.2$, which is 0.7 dex greater thanexpected. The group's high HI content, spatial, velocity, and identified galaxytype distributions strongly suggest that it is in the early stages of itsassembly. The discovery of this galaxy group is an example of the importance ofmapping spatially-resolved HI in a wide range of environments, including galaxygroups. This scientific goal has been dramatically enhanced by the highsensitivity, large field-of-view, and wide instantaneous bandwidth of theMeerKAT telescope.

MIGHTEE-HI: Discovery of an HI-rich galaxy group at z = 0.044 with MeerKAT