Maerjamycetes 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

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.

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.