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An isolated pterygotid ramus (Chelicerata: Eurypterida) from the Devonian Beartooth Butte Formation, Wyoming

  • James C. Lamsdell (a1) and David A. Legg (a2)

An isolated ramus of the pterygotid eurypterid Jaekelopterus cf. howelli from the Early Devonian (Pragian) Beartooth Butte Formation (Cottonwood Canyon, north-western Wyoming) is described. Pterygotid taxonomy and synonymy is briefly discussed with the genera Pterygotus, Acutiramus and Jaekelopterus shown to be potential synonyms. The use of cheliceral denticulation patterns as a generic-level character is discouraged in light of variations within genera and its unsuitability as a major characteristic in the other eurypterid families.

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Agassiz, J. L. R. 1839. Fishes of the Upper Ludlow rock, p. 605607. In Murchison, R. I. (ed.), The Silurian System, Pt. 1. Founded on geological researches in the counties of Salop, Hereford, Radnor, Montgomery, Caermarthen, Brecon, Pembroke, Monmouth, Gloucester, Worcester, and Stafford: With descriptions of the coal-fields and overlying formations. John Murray, London, 768 p.
Agassiz, J. L. R. 1844. Monographie des poisons fossiles du Vieux Gres Rouge, ou Systeme Devonien (Old Red Sandstone) des Iles Britanniques et de Russie. Neufchatel, folio, 171 p.
Braddy, S. J. 2000. Eurypterids from the Early Devonian of the Midland Valley of Scotland. Scottish Journal of Geology, 36:115122.
Braddy, S. J., Poschmann, M., and Tetlie, O. E. 2008a. Giant claw reveals the largest ever arthropod. Biology Letters, 4:106109.
Braddy, S. J., Poschmann, M., and Tetlie, O. E. 2008b. Reply: Giant claws and big bodies. Biology Letters, 4:281.
Burmeister, H. 1843. Die Organisation der Trilobiten, aus ihren lebenden Verwandten entwickelt; nebst systematische Uebersicht aller Seitherbeschriebenen Arten. G. Reimer, Berlin.
Ciurca, S. J. and Tetlie, O. E. 2007. Pterygotids (Chelicerata; Eurypterida) from the Silurian Vernon Formation of New York. Journal of Paleontology, 81(4):725736.
Clarke, J. M. and Ruedemann, R. 1912. The Eurypterida of New York. New York State Museum Memoirs, 14:1439.
Dekay, J. E. 1825. Observations on a fossil crustaceous animal of the order Branchiopoda. Annals of the New York Lyceum of Natural History, 1:375377.
Elliot, D. K. and Ilyes, R. R. 1996. Lower Devonian vertebrate biostratigraphy of the western United States. Modern Geology, 20:253262.
Fiorillo, A. R. 2000. The ancient environment of the Beartooth Butte Formation (Devonian) in Wyoming and Montana: Combining paleontological inquiry with federal management needs. USDA Forest Service Proceedings RMRS-P-15, 3:160167.
Hall, J. 1859. Paleontology of New York, Vol. 3, Containing descriptions and figures of the organic remains of the Lower Heldergerg Group and the Oriskany Sandstones. Albany, New York, 532 p.
Huxley, T. H. and Salter, J. W. 1859. On the anatomy and affinities of the genus Pterygotus and description of new species of Pterygotus. Memoirs of the Geological Survey of the United Kingdom, 1, 105 pp.
Jaekel, O. 1914. Ein grosser Pterygotus aus dem rheinischen Unterdevon. Palaeontologische Zeitschrift, 1:379382.
Kjellesvig-Waering, E. N. 1955. Dorfopterus, a new genus of Eurypterida from the Devonian of Wyoming. Journal of Paleontology, 29(4):696710.
Kjellesvig-Waering, E. N. 1964. A synopsis of the family Pterygotidae Clarke and Ruedemann, 1912 (Eurypterida). Journal of Paleontology, 38:331361.
Kjellesvig-Waering, E. N. 1986. A restudy of the fossil Scorpionida of the World. Palaeontographica Americana, 55:1287.
Kjellesvig-Waering, E. N. and Størmer, L. 1952. A Lower Devonian Pterygotus from Wyoming. Journal of Paleontology, 26(6):997998.
Lamsdell, J. C. and Braddy, S. J. 2010. Cope's Rule and Romer's theory: patterns of diversity and gigantism in eurypterids and Palaeozoic vertebrates. Biology Letters, 6:265269.
Legg, D. A., Braddy, S. J., and Dunlop, J. A. 2009. The supposed scorpion Acanthoscorpio mucronatus Kjellesvig-Waering, recognized as a juvenile eurypterid and its implications for scorpion systematics. Progressive Palaeontology Programme and Abstracts, 19.
Miller, R. F. 2007. Pterygotus anglicus Agassiz (Chelicerata: Eurypterida) from Atholville, Lower Devonian Campbellton Formation, New Brunswick, Canada. Palaeontology, 50:981999.
Ruedemann, R. 1934. Eurypterids from the Devonian of Beartooth Butte, Wyoming. Proceedings of the American Philosophical Society, 73(3):163167.
Ruedemann, R. 1935a. The eurypterids of Beartooth Butte, Wyoming. Proceedings of the American Philosophical Society, 75:129141.
Ruedemann, R. 1935b. A review of the eurypterid rami of the genus Pterygotus with the descriptions of two new Devonian species. Annals of the Carnegie Museum, 24:6972.
Sandberg, C. A. 1961. Widespread Beartooth Butte Formation of Early Devonian age in Montana and Wyoming and its paleogeographic significance. Bulletin of the American Association of Petroleum Geologists, 45:13011309.
Sarle, C. J. 1903. A new eurypterid fauna from the base of the Salina in western New York. New York State Museum Bulletin, 69:10801108.
Schmidt, F. 1883. Die Crustaceenfauna der Eurypterenschichten von Rootziküll auf Oesel, p. 2888. In Miscellanea Silurica III. Memoires l'Academie Imperiale des Sciences de St.-Petersbourgh, series VII, 31(5).
Størmer, L. 1936. Eurypteriden aus dem Rheinischen Unterdevon. Abhandlungen der Preußischen Geologischen Landesanstalt, 175:174.
Tetlie, O. E. 2007a. Distribution and dispersal history of Eurypterida (Chelicerata). Palaeogeography, Palaeoclimatology, Palaeoecology, 252:557574.
Tetlie, O. E. 2007b. Like father, like son? Not amongst the eurypterids (Chelicerata) from Beartooth Butte, Wyoming. Journal of Paleontology, 81:14231431.
Tetlie, O. E. and Briggs, D. E. G. 2009. The origin of the pterygotid eurypterids (Chelicerata: Eurypterida). Palaeontology, 52:11411148.
Tetlie, O. E., Tollerton, V. P. Jr, and Ciurca, S. J. Jr. 2007. Eurypterus remipes and E. lacustris (Chelicerata: Eurypterida) from the Silurian of North America. Bulletin of the Peabody Museum of Natural History, 48(1):139152.
Tollerton, V. P. Jr. 1989. Morphology, taxonomy, and classification of the Order Eurypterida Burmeister, 1843. Journal of Paleontology, 63:642657.
Waterston, C. D. 1964. Observations on pterygotid eurypterids. Transactions of the Royal Society of Edinburgh, 66:933.
Woodward, H. 1864. Descriptions of some new Palaeozoic Crustacea. Geological Magazine, 1:196200.
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Journal of Paleontology
  • ISSN: 0022-3360
  • EISSN: 1937-2337
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