Okimura, Y.; Ishii, K. I.; Nakazawa, K. (1975). Abadehella, a new genus of tetrataxid Foraminifera from the Late Permian. Memoirs of the Faculty of Science, Kyoto University. Series of geology and mineralogy. 41(1): 35-48., available online at (http://hdl.handle.net/2433/186600) page(s): p. 2 pl. 1 figs. 3 (holotype)-4, pl. 3 fig. 2 (apertural section). courtesy of Michael Hesemann https://foraminifera.eu