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 …

Xiphosurans are aquatic chelicerates with a fossil record extending into the Early Ordovician
and known from a total of 88 described species, four of which are extant. Known for their …

In zoological nomenclature, to be potentially valid, nomenclatural novelties (ie, new nomina
and nomenclatural acts) need first to be made available, that is, published in works …

Background Eurypterids are a diverse group of chelicerates known from~ 250 species with a
sparse Ordovician record currently comprising 11 species; the oldest fully documented …

Much of the focus of palaeobiological studies in the last century can be summarized as
seeking to understand how evolutionary lineages occupy new regions of morphological …

The fossil record for neoceratopsian (horned) dinosaurs in the Lower Cretaceous of North
America primarily comprises isolated teeth and postcrania of limited taxonomic resolution …

Deep phylogeny involving arthropod lineages is difficult to recover because the erosion of
phylogenetic signals over time leads to unreliable multiple sequence alignment (MSA) and …

Abstract Background and Aims The evolution of complex rooting systems during the
Devonian had significant impacts on global terrestrial ecosystems and the evolution of plant …

Pterygotid eurypterids have traditionally been interpreted as active, high-level, visual
predators; however, recent studies of the visual system and cheliceral morphology of the …

Mass extinctions have altered the trajectory of evolution a number of times over the
Phanerozoic. During these periods of biotic upheaval a different selective regime appears to …