Aquamastix Tedersoo & Esmaeilzadeh-Salestani, 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

Aquamastix Tedersoo & Esmaeilzadeh-Salestani gen. nov.

Type species.

Aquamastix sanduskyensis Tedersoo & Esmaeilzadeh-Salestani .

Diagnosis.

Distinguishable from other fungi based on diagnostic nucleotide signatures in 5.8S (positions 120–139 ttcctctttg in type species and 118–127 in S. cerevisiae ; no mismatch allowed), SSU V 9 (positions 1685–1699 agtaacttccccttg in S. cerevisiae ; no mismatch allowed), and LSU D 1 (positions 125–139 in type species and 123–137 in S. cerevisiae gtgacggtttaactg; two mismatches allowed). Forms a monophyletic, least inclusive clade in Aquamastigaceae, covering sequences EUK 1124847 and EUK 0320721 (Figs 1 , 17 ).

Notes.

Recognized based on eDNA sequences only. Comprises a single species, Aquamastix sanduskyensis (sp. nov.).

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.

Figure 17. Maximum Likelihood SSU- ITS - LSU phylogram indicating the position of Aquamastix sanduskyensis within Aquamastigomycetes, with ultra-rapid bootstrap values indicated. Other genus-level groups are collapsed. Neocallimastigomycota spp. were used as an outgroup.