Silva, M.B.A., Osti, J.A.S., Bicudo, D.C. and Marquardt, G.C. 2024. Achnanthidium guarulhense sp. nov. (Achnanthidiaceae, Bacillariophyta), a new diatom species from a Conservation Unit in Southeast Brazil. Phytotaxa. 640, 3 (Mar. 2024), 275–283. DOI:https://doi.org/10.11646/phytotaxa.640.3.5.