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Phylogeny, evolution and a re-classification of the Lichinomycetes
M Prieto1,2,3, M Wedin3, M Schultz4
1Area of Biodiversity and Conservation, Department of Biology and Geology, Physics and Inorganic Chemistry, Rey Juan Carlos University, E-28933 Móstoles, Spain.
Studies in Mycology
|December 24, 2024
Summary
This study revises the classification of Lichinomycetes, an important fungal group, using molecular data. The findings reveal significant non-monophyly, leading to a new classification with new genera and families.
Area of Science:
- Mycology
- Lichenology
- Evolutionary Biology
Background:
- The Lichinomycetes lineage within Ascomycota includes approximately 390 species and 50 genera.
- Current classification relies heavily on morphological and anatomical traits, with limited molecular phylogenetic studies.
- Many existing groups within Lichinomycetes require thorough revision to reflect evolutionary relationships.
Purpose of the Study:
- To construct a robust multilocus phylogeny for the Lichinomycetes using molecular data.
- To investigate the evolutionary history of selected characters within the Lichinomycetes.
- To propose a revised classification of the Lichinomycetes based on phylogenetic evidence.
Main Methods:
- A multilocus phylogenetic analysis was conducted using mtSSU, RPB2, and mcm7 gene regions.
- 190 specimens representing 126 species of Lichinomycetes were included in the study.
- Ancestral state reconstruction analyses were performed to infer character evolution.
Main Results:
- Phylogenetic analyses revealed substantial non-monophyly at both family and genus levels within the Lichinomycetes.
- The current classification based on morphology conflicts significantly with the molecular phylogenetic findings.
- The revised classification introduces 11 new genera, resurrects five genera, and establishes 54 new combinations across four families.
Conclusions:
- The study necessitates a significant re-classification of the Lichinomycetes to align with evolutionary history.
- Ancestral Lichinomycetes are reconstructed as crustose with pycnoascocarps and octosporous asci.
- The revised classification provides a more accurate framework for understanding the diversity and evolution of this lichenized fungal group.
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