Maerjamycetes Tedersoo & Esmaeilzadeh-Salestani class. nov.

Type order.

Maerjamycetales Tedersoo & Esmaeilzadeh-Salestani .

Diagnosis.

Distinguishable from other fungi based on diagnostic nucleotide signatures in SSU V 9 (positions 1684–1690 in S. cerevisiae gatgcat; no mismatch allowed) and LSU D 1 (positions 114–122 in type species and 115–123 in S. cerevisiae cactttctg; no mismatch allowed). Forms a monophyletic, least inclusive clade in Mortierellomycota, covering sequences EUK 1200032, EUK 1217336, EUK 1009005, EUK 0484311, EUK 0484301, and EUK 1138158 (Fig. 1).

Notes.

Recognized based on eDNA sequences only. Encoded as clade GS 48 in EUKARYOME v 1.9. Currently harbors Maerjamycetales (ord. nov.). Comprises around five species. Detected in soil (90.6 % out of the 276 records), sediments (7.6 %), water (1.1 %), and old paper (0.7 %) in high arctic to hot tropical biomes across all continents except Antarctica.