Parakickxellomycetes Tedersoo class. nov.

Type order.

Parakickxellales Tedersoo .

Diagnosis.

Separation from other fungi based on diagnostic nucleotide signatures in SSU V 8 (positions 1476–1495 in S. cerevisiae ccaagkcaacgagtytacaa; two mismatches allowed) and LSU D 1 (positions 184–198 in type species and 180–194 in S. cerevisiae ggtataatttgcctg; two mismatches allowed). Forms a monophyletic, least inclusive clade in Kickxellomycota, covering sequences EUK 1189320, EUK 1189314, EUK 1100806, EUK 1189309, UDB 014747, EUK 1107625, EUK 1105293, EUK 1189310, EUK 1700155, EUK 1189325, EUK 1189316, and EUK 1189321 (Fig. 1).

Notes.

Recognized based on eDNA sequences only. Encoded as clade GS 19 in EUKARYOME v 1.9. Currently harbors Parakickxellales. Comprises potentially 1150–1250 species. Detected in soil (98.6 % out of 1597 records), sediments (1.2 %), and water (0.2 %). Found in arctic tundra to tropical biomes across all continents except Antarctica, but present on Subantarctic islands. Relatively more common and diverse in the neotropics (37.3 % of records).