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).