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Advances in molecular techniques over the past decades have significantly shaped the field of systematics and taxonomy. Approaches to species delimitation that employ methods like DNA barcoding and generalized mixed Yule coalescent models are seemingly attractive because they present a more simplifi ...

Higher-level classifications often must account for monotypic taxa representing depauperate evolutionary lineages and lacking synapomorphies of their better-known, well-defined sister clades. In a ranked (Linnean) or unranked (phylogenetic) classification system, discovering such a depauperate taxon ...

Instances of sexual size dimorphism (SSD) provide the context for rigorous tests of biological rules of size evolution, such as Cope’s rule (phyletic size increase), Rensch’s rule (allometric patterns of male and female size), as well as male and female body size optima. In certain spider groups, su ...