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Mass-Rearing and Molecular Studies in Tortricidae Pest Insects
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The genus Cortinarius should not (yet) be split.

Brigida Gallone1, Thomas W Kuyper2,3, Jorinde Nuytinck2,4

  • 1Naturalis Biodiversity Center, Darwinweg 2, 2333 CR, Leiden, The Netherlands. brigida.gallone@naturalis.nl.

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|August 13, 2024
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Summary
This summary is machine-generated.

Phylogenetic analysis reveals unresolved relationships within the fungal genus Cortinarius. Current data suggests the genus should not be split into new genera due to significant gene-tree conflicts and unsupported branching patterns.

Keywords:
ClassificationNomenclaturePhylogenetic conflictPhylogenomics

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Area of Science:

  • Mycology
  • Fungal Phylogenetics
  • Taxonomy

Background:

  • The genus Cortinarius is one of the most species-rich fungal genera, comprising thousands of species globally.
  • Cortinarius species are crucial ectomycorrhizal fungi, forming symbiotic associations with numerous vascular plants.
  • Previous attempts to structure Cortinarius hierarchically were challenging, leading to a recent phylogenomic study that proposed splitting the genus into ten new genera.

Purpose of the Study:

  • To re-examine the phylogenetic relationships within the genus Cortinarius using a recently published phylogenomic dataset.
  • To assess the validity of proposed new genera and the overall phylogenetic hypothesis for Cortinariaceae.
  • To provide recommendations regarding the taxonomic treatment of the genus Cortinarius based on robust phylogenetic evidence.

Main Methods:

  • Utilized concatenation and multispecies coalescent approaches to analyze gene-tree/species-tree conflicts within the phylogenomic dataset.
  • Performed thorough exploration of the tree space to evaluate the reliability of phylogenetic hypotheses.
  • Assessed the monophyly of ten suggested new genera derived from the proposed reclassification.

Main Results:

  • Detected extensive gene-tree/species-tree conflicts, indicating an unresolved phylogeny for Cortinarius.
  • Identified very short and unsupported branches in the backbone of the proposed phylogenetic tree.
  • Confirmed monophyly for only four out of the ten proposed new genera, with uncertain interrelationships and branching order.

Conclusions:

  • The current phylogenomic data is insufficient to support the splitting of the genus Cortinarius.
  • The proposed reclassification relies on a topology that does not represent the best phylogenetic hypothesis.
  • Advise cautious evaluation of phylogenomic datasets before implementing radical taxonomic and nomenclatural changes in fungal classification.