Williams, David M., Pat A. Sims, and Paul Chambers. “Two New Cretaceous Species of Sphynctolethus and a New Name for ‘Sphynctolethus pacificus’ (Bacillariophyta: Hemiaulaceae)”. Phytotaxa 730, no. 1 (November 18, 2025): 75–81. Accessed February 4, 2026. https://phytotaxa.mapress.com/pt/article/view/phytotaxa.730.1.5.