Aquieurochytriomycetes Tedersoo & Esmaeilzadeh-Salestani class. nov.

Type order.

Aquieurochytriales Tedersoo & Esmaeilzadeh-Salestani .

Diagnosis.

Distinguishable from other fungi based on a diagnostic nucleotide signature in LSU D 1 (positions 171–185 in type species and S. cerevisiae ggcaagccgggcaaa OR ggctgctcggacaaa; two mismatches allowed). Forms a monophyletic, least inclusive clade in Chytridiomycota, covering sequences EUK 1107407, AB 971081, EUK 1100022, EUK 1102113, EUK 1123700, and EUK 1102276 (Fig. 1).

Notes.

Recognized based on eDNA sequences only. Encoded as clade GS 59 in EUKARYOME v 1.9. Currently harbors Aquieurochytriales (ord. nov.) and potentially order-level groups represented by sequences EUK 1107407 (peatland soil in Sweden), EUK 0130469 ( woodland soil in Australia), EUK 0519470 (cropland soil in Estonia), and EUK 0569228 (freshwater sediment in Estonia). Comprises potentially 50–60 species. Detected in water (53.8 % out of the 80 records), sediments (32.5 %), and soil (13.7 %) in tundra to tropical biomes in all continents except Antarctica.