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walking on land. Ciurcopterus was first described as a species of Pterygotus, P. ventricosus, by Erik. N. Kjellesvig-Waering in 1948. This species was represented...

Pterygotus is a genus of giant predatory eurypterid, a group of extinct aquatic arthropods. Fossils of Pterygotus have been discovered in deposits ranging...

other species of Pterygotus. British palaeontologist Charles D. Waterston erected the genus Jaekelopterus in 1964 to accommodate Pterygotus rhenaniae, which...

of Acutiramus to be named was A. macropthalmus (as a species of Pterygotus, Pterygotus macrophthalmus) in 1859. The type specimen, the carapace of a young...

Grossopterus, and split Pterygotus into two other subgenera, Pterygotus (Pterygotus) and Pterygotus (Erettopterus), designating Pterygotus (Curviramus) as a...

divide the genus Pterygotus based on the morphology of the telsons of the species that had been assigned to it. He divided Pterygotus into subgenera, including...

lingulaformis †Pterotocrinus rugosus †Pterotocrinus spatulatus †Pterygotus †Pterygotus ventricosus †Ptychocarpus †Ptychocarpus unitus †Ptychopleurella †Ptylopora...

the genera Pterygotus, Slimonia, Hastimima and Hughmilleria. Pterygotus had also been designated as containing two subgenera; Pterygotus (Curviramus)...

Salter. Three years later, Salter erroneously assigned H. banksii to Pterygotus (Erettopterus) based on bilobed telsons of Erettopterus spatulatus that...

maximus and H. perornatus. Salter described the species Pterygotus acuminata. Page transferred Pterygotus acuminata to its own genus, Slimonia. Page named and...

amorphognathoides †Pterotheca †Pterotheca expansa †Pterygotus †Pterygotus cobbi †Pterygotus juvensis †Pterygotus monroensis †Ptilodictya †Ptilodictya plumea...

considered Hughmilleria as an intermediate form between Eurypterus and Pterygotus. However, he did not assigned Hughmilleria to any family. Hughmilleria...

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). The telson...