Integrative approach to species delimitation in Rhizophydiales: Novel species of Angulomyces, Gorgonomyces, and Terramyces from northern Thailand

[Display omitted] •Introduction of new chytrid taxa in Thailand.•Integrative and polyphasic approach to species delimitation.•New ecological and geographical information on chytrids.•Genetic diversity within Rhizophydiales. The Chytridiomycota is a phylum of zoosporic eufungi that inhabit terrestria...

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Published in:Molecular phylogenetics and evolution 2023-03, Vol.180, p.107706-107706, Article 107706
Main Authors: Hurdeal, Vedprakash G., Longcore, Joyce E., Gareth Jones, E.B., Rabern Simmons, D., Hyde, Kevin D., Gentekaki, Eleni
Format: Article
Language:English
Subjects:
3 new taxa
Chytridiomycota - genetics
Chytrids
DNA, Fungal - genetics
Fresh Water
Fungal diversity
Humans
Molecular phylogeny
Phylogeny
Species delimitation
Thailand
Zoosporic fungi
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Summary:[Display omitted] •Introduction of new chytrid taxa in Thailand.•Integrative and polyphasic approach to species delimitation.•New ecological and geographical information on chytrids.•Genetic diversity within Rhizophydiales. The Chytridiomycota is a phylum of zoosporic eufungi that inhabit terrestrial, freshwater, and oceanic habitats. Within the phylum, the Rhizophydiales contains several monotypic families theorized to hold a diverse assemblage of fungi yet to be discovered and properly described. Based on morphology alone, many species in this order are difficult or impossible to identify. In this study, we isolated three chytrids from northern Thailand. Phylogenetic analyses placed the isolates in three monotypic genera within Rhizophydiales. Intrageneric genetic distances in the internal transcribed spacer (ITS) ranged between 1.5 and 8.5%. Angulomyces solicola sp. nov. is characterized by larger sporangia, spores, and fewer discharge papilla than A.argentinensis; Gorgonomyces thailandicus sp. nov. has larger zoospores and fewer discharge papillae in culture compared to G. haynaldii; Terramyces chiangraiensis sp. nov. produces larger sporangia than T. subangulosum. We delimited species of Angulomyces, Gorgonomyces and Terramyces using a tripartite approach that employed phylogeny, ITS genetic distances and Poisson tree processes (PTP). Results of these approaches suggest more than one species in each genus. This study contributes to the knowledge of chytrids, an understudied group in Thailand and worldwide.
ISSN:1055-7903
1095-9513
DOI:10.1016/j.ympev.2023.107706