Horseshoe crabs (Xiphosura sensu lata) are one of the most iconic groups of extant
chelicerates, with a stunning fossil record reaching back to at least the Lower Ordovician …

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 …

Records of evolutionary stasis over time are central to uncovering large-scale evolutionary
modes, whether by long-term gradual change or via enduring stability punctuated by rapid …

Xiphosurida—crown group horseshoe crabs—are a group of morphologically conservative
marine chelicerates (at least since the Jurassic). They represent an idealised example of …

Horseshoe crabs are archetypal marine chelicerates with a fossil record extending from the
Lower Ordovician to today. The major horseshoe crab groups are thought to have arisen in …

Horseshoe crabs are an iconic group of marine chelicerates that have an impressive fossil
record extending back to at least the Lower Ordovician. Despite their long fossil record and …

Representatives of Austrolimulidae exhibit the most extreme morphological variation
documented within true horseshoe crabs. Relative to the more standard morphologies of …

Horseshoe crabs are archetypal marine chelicerates with an exceptionally long fossil record.
Due to the historical nature of the genus Limulus, which extends back to Linnaeus' …

Horseshoe crabs within Austrolimulidae represent the extreme limits to which the xiphosurid
Bauplan could be modified. Recent interest in this group has uncovered an unprecedented …