Global patterns of biodiversity are influenced by spatial and environmental variations in the
rate at which new species form. We relate variations in speciation rates to six key patterns of …

Methodological and biological considerations are intertwined when studying cryptic species.
A potentially large component of modern biodiversity, the frequency of cryptic species …

Progress in the development and use of methods for species delimitation employing
phenotypic data lags behind conceptual and practical advances in molecular genetic …

The concept of evolvability—the capacity of a population to produce and maintain
evolutionarily relevant variation—has become increasingly prominent in evolutionary …

The accumulation of diversity is dependent on the production (and subsequent continuation)
of new species; thus, it is important to contextualize the Great Biodiversification Event …

Whether large‐scale variation in lineage diversification rates can be predicted by species
properties at the population level is a key unresolved question at the interface between …

Tracking the origins of new species and delimiting taxa across space and time present well-
trodden sources of controversy for palaeoanthropology. Although biological diversity comes …

Trilobites offer one of the best fossil records of any arthropod group. This is due to a number
of factors, most notably the combination of (1) having inhabited areas where organisms are …

The extant graptolite Rhabdopleura recondita has been so far recorded only as inhabiting a
bryozoan skeleton. Its larval settlement and metamorphosis are possible in the absence of a …

In a recent review, Vaux, Trewick & Morgan-Richards (2016) argued that species are
'arbitrary', speciation virtually unstudyable (especially in the fossil record), and that the terms …