Fossil Xiphosura are known from all geological systems from the Cambrian onward. A
distinct trend of development, particularly from the Silurian to Recent time, is demonstrated …

The monophyly of the class Xiphosura is critically re-examined. For the first time a
phylogenetic analysis of a number of synziphosurine and xiphosurid taxa is performed …

The fossil record of the basic xiphosurid horseshoe crab body plan has been extended back
to the Late Ordovician Period, about 445 million years ago, demonstrating an origin that lies …

The Xiphosurida, or horseshoe crabs, are often cited as a classic example of arrested
evolution. They have been so consistently associated with this concept, in both professional …

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 …

A remarkable new fossil horseshoe crab, Lunataspis aurora gen. et sp. nov., from recently
discovered Upper Ordovician (c. 445 Ma) shallow marine Konservat‐Lagerstätten deposits …

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 …

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

Pennsylvanian strata of Kansas have yielded two species of xiphosurids (horseshoe crabs).
The exceptionally preserved fossils are from inferred coastal (estuarine or tidal flat) …

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 …