Advancing mite phylogenomics: Designing ultraconserved elements for Acari phylogeny

Area of Science:

• Arthropod genomics
• Evolutionary biology
• Phylogenetics

Background:

• Mites (Acari) represent immense biodiversity, but their evolutionary relationships remain largely unresolved.
• Arachnid phylogeny studies are limited by the underrepresentation of mite diversity in phylogenomic analyses.

Purpose of the Study:

• To develop targeted ultraconserved element (UCE) probes for Acari to improve understanding of mite and arachnid evolutionary history.
• To resolve complex phylogenetic relationships within mites and their closely related arachnid orders.

Main Methods:

• Design and in-silico testing of novel Acari-specific UCE probe sets.
• Phylogenomic analysis using 13 existing Acari genomes and 6 additional arachnid taxa.
• Comparison of locus recovery using Acari-specific versus general arachnid UCE probes.

Main Results:

• Acari-specific UCE probes significantly enhance locus recovery within mites compared to general arachnid probes.
• The initial phylogeny successfully recovers major mite lineages.
• Mites (Acari) were found to be non-monophyletic, with Opiliones and Ricinuleidae nested within, rendering the order Parasitiformes paraphyletic.

Conclusions:

• Targeted UCE probes are effective tools for advancing Acari phylogenomics.
• The non-monophyly of mites necessitates a re-evaluation of Acari classification and evolutionary history.
• Incorporating diverse mite genomic data is crucial for resolving broader arachnid evolutionary patterns.