Énay, R. and Howarth, M.K. 2018. Stevensites, Zittelites, and Gyrophylloceras, new generic names proposed for Stevensia Énay, 2009, Zittelia Tavera Benitez, 1985, and Gyrophyllites Wiedmann, 1963 (Mollusca: Ammonoidea). Paleontological Contributions. 19 (Apr. 2018), 1–2. DOI:https://doi.org/10.17161/1808.26312.