M_HI vs. M_* for all MIGHTEE galaxies in XMM-LSS. The UDGs and LSBGs are indicated, and the diagonal solid, dashed, and dotted lines indicate M_HI to M_* ratios of 1, 10, and 100. All stellar masses are derived from SED estimates. Galaxies from this work that meet only the LSBG definition (green circles), UDG definition (blue diamonds), or both (gray squares) are indicated separately. The solid red line indicates the relation from the ALFALFA survey (Huang et al. 2012).