Tibetochytriomycetes Tedersoo

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

Tibetochytriomycetes Tedersoo class. nov.

Type order.

Tibetochytriales Tedersoo .

Diagnosis.

Distinguishable from other fungi based on diagnostic nucleotide signatures in SSU V 4 (positions 722–736 in S. cerevisiae gtgggttagggatcc or gtgggttagggagct; one mismatch allowed), 5.8S (positions 120–134 in type species and S. cerevisiae gctggtattccggcg or tttggtatcccgaag; one mismatch allowed), and LSU D 2 (positions 505–619 in type species and 600–614 in S. cerevisiae ggcttagctggatac or agcttttgcagggat; two mismatches allowed). Forms a monophyletic, least inclusive clade in Chytridiomycota, covering sequences EUK 1186747 , EUK 1123755 , EUK 1186750 , EUK 1102822 , and EUK 1186746 (Fig. 1 ).

Notes.

Recognized based on eDNA sequences only. Encoded as clade GS 43 in EUKARYOME v 1.9. Currently harbors Tibetochytriales (ord. nov.). Comprises around five potential species. Detected in soil (91.6 % out of the 24 records), once in roots, and once in sediments. Found in tundra to wet tropical biomes across all continents except Antarctica.

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.