Aquamastigomycetes Tedersoo & Esmaeilzadeh-Salestani

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

Aquamastigomycetes Tedersoo & Esmaeilzadeh-Salestani class. nov.

Type order.

Aquamastigales Tedersoo & Esmaeilzadeh-Salestani .

Diagnosis.

Distinguishable from other fungi based on a diagnostic nucleotide signature in SSU V 4 (positions 966–975 gatcaagagc in S. cerevisiae ; no mismatch allowed). Forms a monophyletic, least inclusive clade in Neocallimastigomycota, covering sequences EUK 1102371 , EUK 1107057 , EUK 1124848 , EUK 1138328 , EUK 1102991 , EUK 1124847 , and EUK 0320721 (Fig. 1 ).

Notes.

Recognized based on eDNA sequences only. Encoded as clade GS 38 in EUKARYOME v 1.9. Currently harbors Aquamastigales (ord. nov.). Comprises 15–20 species. Detected in sediment (72.4 % out of 29 records), freshwater (6.9 %), and soil (17.2 %) samples in tundra to subtropical biomes in Eurasia, North America, and South America. The predominant records from sediments and flooded soils suggest that members of this class are facultative anaerobes.

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.