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The fragmentary fossils closely resemble fossils of Erettopterus bilobus (classified as a species of Pterygotus at the time), which might make their assignment to Pterygotus questionable. [19] In 2020, the species was marked as a nomen dubium (a dubious species) due to the lack of sufficient diagnostic material to separate P. australis from the ...
Pterygotidae (the name deriving from the type genus Pterygotus, meaning "winged one") is a family of eurypterids, an extinct group of aquatic arthropods.They were members of the superfamily Pterygotioidea.
Pterygotioidea (the name deriving from the type genus Pterygotus, meaning "winged one") is a superfamily of eurypterids, an extinct group of aquatic arthropods. Pterygotioids were the most derived members of the infraorder Diploperculata and the sister group of the adelophthalmoid eurypterids.
A majority of fossils are from fossil sites in North America and Europe because the group lived primarily in the waters around and within the ancient supercontinent of Euramerica. Only a handful of eurypterid groups spread beyond the confines of Euramerica and a few genera, such as Adelophthalmus and Pterygotus , achieved a cosmopolitan ...
The type specimen of A. cummingsi (a coxa, left) and the type specimen of "Pterygotus buffaloensis" (an appendage including the coxa and part of a chelae, right).. The earliest species of Acutiramus to be named was A. macropthalmus (as a species of Pterygotus, Pterygotus macrophthalmus) in 1859.
The earliest eurypterid reconstruction; a figure of Eurypterus remipes by James E. De Kay (1825).. This timeline of eurypterid research is a chronologically ordered list of important fossil discoveries, controversies of interpretation, and taxonomic revisions of eurypterids, a group of extinct aquatic arthropods closely related to modern arachnids and horseshoe crabs that lived during the ...
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]
Necrogammarus salweyi is the binomial name applied to an arthropod fossil discovered in Herefordshire, England.The fossil represents a fragmentary section of the underside and an appendage of a pterygotid eurypterid, a group of large and predatory aquatic arthropods that lived from the late Silurian to the late Devonian.
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