Sunnaginia is a tommotiid known from the Comely Limestone and elsewhere, and appears to represent one of the closest relatives to the brachiopod crown group, in a more derived position than Eccentrotheca.
Species taxanomy provided by GBIF Secretariat (2022). GBIF Backbone Taxonomy. Checklist dataset https://doi.org/10.15468/39omei accessed via GBIF.org on 2023-06-13; License: CC BY 4.0