Tartumycota Tedersoo, 2025

Tedersoo, Leho, Hosseyni Moghadam, Mahdieh S., Panksep, Kristel, Prins, Victoria, Anslan, Sten, Mikryukov, Vladimir, Bahram, Mohammad, Abarenkov, Kessy, Kõljalg, Urmas, Esmaeilzadeh-Salestani, Keyvan, Pawłowska, Julia, Wurzbacher, Christian, Ding, Yi, Alkahtani, Saad Hussin & Nilsson, R. Henrik, 2025, Thirty novel fungal lineages: formal description based on environmental samples and DNA, MycoKeys 124, pp. 1-121 : 1-121

Tartumycota Tedersoo phyl. nov.

Type class.

Tartumycetes Tedersoo.

Diagnosis.

Distinguishable from other fungi based on a diagnostic nucleotide signature in LSU D 3 (positions 1009–1023 in the type species and 969–983 in S. cerevisiae ggaacttgtacagtt, no mismatch allowed). Forms a monophyletic, least inclusive clade in fungi, covering sequences OQ 702815, EUK 1186161 , OQ 687331, EUK 1186165 , EUK 1186157 , EUK 1200073 , EUK 1186162 , EUK 1123648 , EUK 1138300 , OQ 702816, ON 754309, UDB 028835 , and HQ 191300 (Fig. 1 ).

Notes.

Recognized based on eDNA and single-cell sequences only. Encoded as “ freshol 1 ” and clade BCG 2 in previous studies and EUKARYOME v 1.9. Currently harbors Tartumycetes (class. nov.) and potentially a class-level group represented by sequences OQ 687331 (lake water in MI, USA), OQ 702815 (algal sample in MI, USA), EUK 1186161 , and EUK 1186165 (both rotting algae in Estonia). Comprises potentially 100–110 species. Detected in soil (64.9 % out of 296 records), water (22.0 %), sediments (8.8 %), and algae (4.4 %) in tundra to hot tropical biomes across all continents except Antarctica. Microscopic analyses of freshwater algae suggest parasitic interactions. It is possible that Tartumycota spp. are parasitic on soil and aquatic algae.

Figures

Figure 1. Maximum Likelihood SSU- 5.8 S-LSU phylogram indicating placement of novel lineages in the fungal kingdom as highlighted in a coloured shade and red font. Previously described taxonomic clades are collapsed. All branches of Sumavosporidiomycetes and Gelotisporidiomycetes are shortened two-fold. Poorly supported branches with bootstrap values below 95 % / 99 % are indicated in blue. The original tree with bootstrap values and uncollapsed branches is indicated in Suppl. material 1.