Phylogenomics underpins a stable and mostly well-resolved hypothesis for the
interrelationships of extant arthropods. Exceptionally preserved fossils are integrated into …

Horseshoe crabs are an iconic group of extant chelicerates, with a stunning fossil record that
extends to at least the Lower Ordovician (~ 480 million years ago). As such, the group has …

Despite significant advances in invertebrate phylogenomics over the past decade, the
higher-level phylogeny of Pycnogonida (sea spiders) remains elusive. Due to the …

Regenerative abilities and their evolution in the different animal lineages have fascinated
generations of biologists. While some taxa are capable of restoring entire individuals from …

The chelicerates are a ubiquitous and speciose group of animals that has a considerable
ecological effect on modern terrestrial ecosystems—notably as predators of insects and …

Miniaturization is an evolutionary trend observed in many animals. Some arachnid groups,
such as spiders and mites, demonstrate a strong tendency toward miniaturization. Some of …

Spiders (Araneae) are a hugely successful lineage with a long history. Details of their origins
remain obscure, with little knowledge of their stem group and few insights into the sequence …

The Wnt genes represent a large family of secreted glycoprotein ligands that date back to
early animal evolution. Multiple duplication events generated a set of 13 Wnt families of …

Limulus polyphemus, an archetypal chelicerate taxon, has interested both biological and
paleontological researchers due to its unique suite of anatomical features and as a useful …

Segmentation is fundamental to the arthropod body plan. Understanding the evolutionary
steps by which arthropods became segmented is being transformed by the integration of …