Investigations of CZEUM cultures reveal new genera and species of Cladochytriales (Cladochytriomycetes, Chytridiomycota)

Author:

Jeronimo Gustavo Henrique1ORCID,Simmons D. Rabern2,Longcore Joyce E3,James Timothy Y.4,Amses Kevin R.4,Seto Kensuke5,Pires-Zottarelli Carmen L.A.1

Affiliation:

1. Instituto de Botânica de São Paulo: Instituto de Botanica de Sao Paulo

2. Purdue University

3. University of Maine

4. University of Michigan

5. Yokohama National University: Yokohama Kokuritsu Daigaku

Abstract

Abstract Cladochytriales comprises a taxonomic order and lineage of chytrid fungi that are primarily saprobes of organic matter in aquatic and terrestrial ecosystems. The order contains species from twelve genera, though molecular confirmations of almost all type species are lacking, and many genera are considered polyphyletic. We conducted phylogenetic analyses of ribosomal RNA genes and developmental morphology comparisons of Cladochytriales isolates from the Collection of Zoosporic Eufungi at the University of Michigan and noted some strains that were distinct from described genera. The present phylogeny represents the most comprehensive analysis of Cladochytriales to date with three strongly supported clades, representing Cladochytriaceae, Nowakowskiellaceae and Septochytriaceae. Additionally, Endochytriaceae represented by only one strain of Endochytrium ramosum was sister to Septochytriaceae, Nephrochytrium sp. JEL125 was sister to Cladochytriaceae, while the incertae sedis lineage formed by the new species Thomazella caroliniana was sister to Nowakowskiellaceae. A thorough revision of the order is needed because some genera, such as Catenochytridium and Nephrochytrium, remain polyphyletic or paraphyletic. In addition to indicating these problems, our updated phylogeny supports the description of five new genera and six new species and thereby begins to bring the knowledge of the Cladochytriales up to date.

Publisher

Research Square Platform LLC

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