Sims, P.A., Ashworth, M.P., Theriot, E.C. and Manning, S.R. (2023) Molecular and morphological analysis of Biddulphia sensu lato: a new diagnosis of Biddulphia, with a description of the new genera Biddulphiella and Neobrightwellia. Marine Micropaleontology 178{102186}: 1-21.