Biodiversity and Phylogenetics of Pseudoscorpions

Pseudoscorpions are minute arachnids found in virtually all terrestrial habitats, from tropical rainforests to temperate woodlands and subterranean karst systems. With over 3 600 described species across more than 430 genera, they exhibit remarkable ecological breadth as predators of mites, springtails and small insects. Despite their morphological conservatism—lacking a tail and sting—they display deep evolutionary roots extending to the Devonian, making them among the oldest lineages to colonise land. Traditional taxonomy, based on claw and carapace morphology, has often underestimated true diversity owing to high levels of crypsis. In recent years, molecular phylogenetic methods, including mitochondrial and nuclear gene sequencing, have revealed extensive cryptic speciation, refined family‐ and genus‐level relationships and uncovered biogeographical patterns shaped by ancient landmass fragmentation, climate change and karst microhabitats. These insights are vital for conservation planning, as many lineages are short‐range endemics confined to single caves or isolated mountain systems. Moreover, integrative approaches combining morphology, genomics and cytogenetics are transforming our understanding of pseudoscorpion evolution, distribution and ecological roles in soil and cave ecosystems worldwide.

Research from Nature Portfolio

Recent molecular work in a Mediterranean karst hotspot employed hundreds of mitochondrial COI sequences from both surface and cave‐dwelling species to reconstruct phylogenetic trees and delineate species boundaries. The study uncovered a high proportion of undescribed lineages within genera that exhibit ongoing diversification driven by karstic microhabitats. Landscape features such as mountain ranges and subterranean corridors were shown to correlate closely with genetic breaks, emphasising the role of microrefugia in both speciation and persistence during climatic oscillations. Species delineation analyses highlighted low optimal thresholds for genetic distance, signalling recent radiations in key genera and prompting taxonomic revisions through the synonymy of several historic names.

Biodiversity and Phylogenetics of Pseudoscorpions publication trend

The graph below shows the total number of articles in biodiversity and phylogenetics of pseudoscorpions across all publications each year (not limited to Nature Index journals).

Technical terms

Cryptic diversity: Hidden species diversity not apparent from morphology alone.

Microendemism: Occurrence of species restricted to very small geographic areas.

Phylogenetic reconstruction: Inference of evolutionary relationships among taxa using genetic data.

DNA barcoding: Use of a standard gene region (often COI) to identify or distinguish species.

Morphological stasis: Little or no change in form over long evolutionary time spans.

References

1. Molecular analyses of pseudoscorpions in a subterranean biodiversity hotspot reveal cryptic diversity and microendemism. Scientific Reports (2023).
2. The fossil history of pseudoscorpions (Arachnida: Pseudoscorpiones). Fossil Record (2017).
3. The dark side of pseudoscorpion diversity: The German Barcode of Life campaign reveals high levels of undocumented diversity in European false scorpions. Ecology and Evolution (2021).
4. Integrative Taxonomy Approach Reveals Cryptic Diversity within the Phoretic Pseudoscorpion Genus Lamprochernes (Pseudoscorpiones: Chernetidae) †. Insects (2023).