HOWARTH, Michael K. Treatise Online no. 84: Part L, Revised, Volume 3B, Chapter 6: Systematic Descriptions of the Stephanoceratoidea and Spiroceratoidea. Treatise Online, [S. l.], 2017. DOI: 10.17161/to.v0i0.6521. Disponível em: https://journals.ku.edu/treatiseonline/article/view/6521.. Acesso em: 24 jul. 2024.