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Eurypterid trackways have been referred to several ichnogenera, most notably Palmichnium (defined as a series of four tracks often with an associated drag mark in the mid-line), [24] wherein the holotype of the ichnospecies P. kosinkiorum preserves the largest eurypterid footprints known to date with the found tracks each being about 7.6 ...
Eurypterus, the most commonly found eurypterid fossil and the first eurypterid genus to be described. This list of eurypterid genera is a comprehensive listing of all genera that have ever been included in the order Eurypterida, excluding purely vernacular terms.
Megalograptidae are a family of eurypterids, an extinct group of chelicerate arthropods commonly known as "sea scorpions".. The megalograptids were likely the first major successful group of eurypterids, evidenced by a Late Ordovician radiation.
Eurypteridae is an extinct family of eurypterids that lived in the Silurian and Devonian periods. The family is one of three families contained in the superfamily Eurypteroidea (along with Dolichopteridae and Strobilopteridae), which in turn is one of the superfamilies classified as part of the suborder Eurypterina. [1]
Restoration of H. socialis. Hughmilleria is the most basal (primitive) known member of the Pterygotioidea. [1] It was a small-sized eurypterid, with the largest specimen measuring 20 cm (8 in), being surpassed by other members of its superfamily, such as Slimonia acuminata, which measured 100 cm (39 in) in length, and Pterygotus grandidentatus, which could reach 1.75 meters (5 ft 8 in). [2]
Seventy-five percent of eurypterid species are eurypterines; this represents 99% of specimens. [2] The superfamily Pterygotioidea is the most species-rich clade, with 56 species, followed by the Adelophthalmoidea with 43 species; as sister taxa, they comprise the most derived eurypterines.
Hibbertopterus is a genus of eurypterid, a group of extinct aquatic arthropods.Fossils of Hibbertopterus have been discovered in deposits ranging from the Devonian period in Belgium, Scotland and the United States to the Carboniferous period in Scotland, Ireland, the Czech Republic and South Africa.
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