Phylogenetic classification of arbuscular mycorrhizal fungi: new species and higher-ranking taxa in Glomeromycota and Mucoromycota (class Endogonomycetes) Author Tedersoo, Leho Mycology and Microbiology Center, University of Tartu, 2 Liivi, 50409 Tartu, Estonia & Department of Zoology, College of Science, King Saud University, 12371 Riyadh, Saudi Arabia Author Magurno, Franco 0000-0002-3117-8149 Institute of Biology, Biotechnology and Environmental Protection, Faculty of Natural Sciences, University of Silesia in Katowice, Jagiellońska 28, 40 - 032 Katowice, Poland Author Alkahtani, Saad 0000-0001-7381-5110 Department of Zoology, College of Science, King Saud University, 12371 Riyadh, Saudi Arabia Author Mikryukov, Vladimir 0000-0003-2786-2690 Mycology and Microbiology Center, University of Tartu, 2 Liivi, 50409 Tartu, Estonia text MycoKeys 2024 2024-08-09 107 249 271 journal article 10.3897/mycokeys.107.125549 Densosporales Tedersoo ord. nov. Type family. Densosporaceae Desirò, M. E. Sm., Bidartondo, Trappe & Bonito. Description. Densosporales is defined as a monophyletic group in Endogonomycetes (Fig. 2 , Suppl. material 3 ) that corresponds to Densosporaceae sensu Desiro et al. (2017) . Covers Densosporacae and Planticonsortiaceae and the least inclusive clade with sequence accessions UDB 028692, EUK 1104889, EUK 1104816 and EUK 1601509 (Suppl. material 3 ). Notes. Densosporales harbours roughly one half of the Endogonomycetes based on LSU data. It comprises Densosporacae , Planticonsortiaceae and 16 additional family-level groups collectively covering> 200 species. LSU has much greater phylogenetic resolution compared with SSU (Suppl. materials 3 , 4 ), and the potential utility of the ITS region seems to vary greatly by family. Many more ITS - LSU sequences are needed to understand family- and genus-level composition of Densosporales .