Computer-aided visualization and analysis of fossils has revolutionized the study of extinct
organisms. Novel techniques allow fossils to be characterized in three dimensions and in …

Fossil age data and molecular sequences are increasingly combined to establish a
timescale for the Tree of Life. Arthropods, as the most species-rich and morphologically …

Horseshoe crabs (Xiphosura) are traditionally regarded as sister group to the clade of
terrestrial chelicerates (Arachnida). This hypothesis has been challenged by recent …

Chelicerata represents one of the oldest groups of arthropods, with a fossil record extending
to the Cambrian, and is sister group to the remaining extant arthropods, the mandibulates …

Fossil spiders have not been fully cataloged since Bonnet's Bibliographia Araneorum and
are not included in the current Catalog. Since Bonnet's time there has been considerable …

Exceptionally preserved fossils from the Palaeozoic era provide crucial insights into
arthropod evolution, with recent discoveries bringing phylogeny and character homology …

Whole-genome duplication (WGD) results in new genomic resources that can be exploited
by evolution for rewiring genetic regulatory networks in organisms. In metazoans, WGD …

The rise of arthropods is a decisive event in the history of life. Likely the first animals to have
established themselves on land and in the air, arthropods have pervaded nearly all …

The panarthropod head represents a complex body region that has evolved through the
integration and functional specialization of the anterior appendage-bearing segments …

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 …