Tropicochytriomycetes Tedersoo

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

Tropicochytriomycetes Tedersoo class. nov.

Type order.

Tropicochytriales Tedersoo .

Diagnosis.

Distinguishable from other fungi based on diagnostic nucleotide signatures in SSU V 4 (positions 841–850 in S. cerevisiae tccgggracc; no mismatch allowed) and LSU D 2 (positions 598–607 in the type species and 592–601 in S. cerevisiae agcagcgctg; one mismatch allowed). Forms a monophyletic, least inclusive clade in Chytridiomycota, covering sequences EUK 1102342 , EUK 1186762 , EUK 1100009 , EUK 1186758 , EUK 0519487 , EUK 1186756 , and EUK 1102527 (Fig. 1 ).

Notes.

Recognized based on eDNA sequences only. Encoded as clade GS 60 in EUKARYOME v 1.9. Currently harbors Tropicochytriales (ord. nov.). Comprises potentially around 220–230 species. Detected in soil (98.0 % out of the 299 records) and sediments (2.0 %). Found in warm temperate to tropical biomes across all continents (except Antarctica), especially in neotropical habitats (46.3 % of records). Only 3.0 % of records originate from cool temperate localities (in Europe).

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.