Parakickxella Tedersoo, 2025

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

Parakickxella Tedersoo gen. nov.

Type species.

Parakickxella borikenica Tedersoo .

Diagnosis.

Separation from other fungi based on diagnostic nucleotide signatures in SSU V 3 (positions 677–691 in S. cerevisiae gttccgcccggtctc; one mismatch allowed) and LSU D 2 (positions 697–711 in the type species and 687–701 in S. cerevisiae cgacacgtcatggtg; one mismatch allowed). Forms a monophyletic, least inclusive clade in Parakickxellaceae, covering sequences EUK 1189325 , EUK 1189316 , and EUK 1189321 (Figs 1 , 47 ).

Notes.

Recognized based on eDNA sequences only. Comprises potentially about 150–170 species represented by sequences EUK 1189325 (forest soil in Puerto Rico), EUK 1189316 (forest soil in Dominica), EUK 1189312 (forest soil in Dominica), EUK 0483976 (forest soil in Guadeloupe), EUK 1189319 (forest soil in Guadeloupe), EUK 0530705 (forest soil in Costa Rica), EUK 1189316 (forest soil in Dominica), and EUK 1189306 (forest soil in Puerto Rico).

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.

Figure 47. Maximum Likelihood SSU- ITS - LSU phylogram indicating the position of Parakickxella borikenica within Parakickxellomycetes, with ultra-rapid bootstrap values indicated (for higher-level classifications mainly). Other genus-level groups are collapsed. Zoopagomyceta spp. were used as an outgroup.