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 …

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 …

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 …

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 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 …

Horseshoe crabs are an archetypal chelicerate group with a fossil record extending back to
Early Ordovician time. Although extensively studied, the group generally has a low diversity …

Xiphosurids are an archaic group of aquatic chelicerate arthropods, generally known by the
colloquial misnomer of 'horseshoe crabs'. Known from marine environments as far back as …

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 …

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