Persons, W. Scott; Acorn, John (2017). «A Sea Scorpion's Strike: New Evidence of Extreme Lateral Flexibility in the Opisthosoma of Eurypterids». The American Naturalist (em inglês). 190 (1): 152–156. PMID28617636. doi:10.1086/691967
Kjellesvig-Waering, Erik N. (1961). «The Silurian Eurypterida of the Welsh Borderland». Journal of Paleontology. 35 (4): 789–835. JSTOR1301214
Kjellesvig-Waering, Erik N. (1964). «A Synopsis of the Family Pterygotidae Clarke and Ruedemann, 1912 (Eurypterida)». Journal of Paleontology. 38 (2): 331–361. JSTOR1301554
Persons, W. Scott; Acorn, John (2017). «A Sea Scorpion's Strike: New Evidence of Extreme Lateral Flexibility in the Opisthosoma of Eurypterids». The American Naturalist (em inglês). 190 (1): 152–156. PMID28617636. doi:10.1086/691967