Rasmussen, Jan Audun, Mats E. Eriksson, and Anders Lindskog. “Middle Ordovician Drepanoistodus (Vertebrata, Conodonta) from Baltica, With Description of Three New Species”. European Journal of Taxonomy 774, no. 1 (October 8, 2021): 106–134. Accessed November 22, 2024. https://europeanjournaloftaxonomy.eu/index.php/ejt/article/view/1533.