Hostname: page-component-cd9895bd7-fscjk Total loading time: 0 Render date: 2024-12-26T04:19:03.993Z Has data issue: false hasContentIssue false

The Silurian encrinurine trilobite Pacificurus: new species from North America

Published online by Cambridge University Press:  14 July 2015

Gregory D. Edgecombe
Affiliation:
Department of Geology, University of Alberta, Edmonton T6G 2E3, Canada
Lars Ramsköld
Affiliation:
Department of Palaeozoology, Swedish Museum of Natural History, Box 50007, S-104 05 Stockholm

Abstract

The first Laurentian records of Pacificurus Ramsköld, 1986 are provided by Pacificus chilorhodus n. sp. (latest Llandovery?–early Wenlock, Mackenzie Mountains, Canada) and Pacificurus sp. A (early Ludlow, northern Maine). These closely related species represent an early divergence (minimally late Llandovery) from Australian/Asian congenerics.

Type
Research Article
Copyright
Copyright © The Paleontological Society 

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Angelin, N. P. 1854. Palaeontologia Scandinavica. I. Crustacea formationis transitionis. Fascicule, 2:2192.Google Scholar
Berry, W. B. N., and Boucot, A. J. 1970. Correlation of the North American Silurian rocks. Geological Society of America, Special Paper, 102:1289.Google Scholar
Boucot, A. J., Field, M. T., Fletcher, R., Forbes, W. H., Naylor, R. S., and Pavlides, L. 1964. Reconnaissance bedrock geology of the Presque Isle quadrangle, Maine. Maine Geological Survey Quadrangle Mapping Series, 2, 123 p.Google Scholar
Edgecombe, G. D., and Chatterton, B. D. E. 1987. Heterochrony in the Silurian radiation of encrinurine trilobites. Lethaia, 20:337351.CrossRefGoogle Scholar
Edgecombe, G. D., and Chatterton, B. D. E. 1990. Mackenziurus, a new genus of the Silurian “Encrinurusvariolaris plexus (Trilobita). American Museum Novitates, 2968, 22 p.Google Scholar
Edgecombe, G. D., and Chatterton, B. D. E. 1992. Early Silurian (Llandovery) encrinurine trilobites from the Mackenzie Mountains, Canada. Journal of Paleontology, 66:5274.CrossRefGoogle Scholar
Edgecombe, G. D., Speyer, S. E., and Chatterton, B. D. E. 1988. Protaspid larvae and phylogenetics of encrinurid trilobites. Journal of Paleontology, 62:779799.Google Scholar
Etheridge, R., and Mitchell, J. 1916. The Silurian trilobites of New South Wales. Part V. The Encrinuridae. Proceedings of the Linnaean Society of New South Wales, 40:646680.CrossRefGoogle Scholar
Fletcher, H. O. 1950. Trilobites from the Silurian of New South Wales. Records of the Australian Museum, 22:220233.CrossRefGoogle Scholar
Foerste, A. F. 1888. Notes on Paleozoic fossils. Bulletin of the Scientific Laboratories of Denison University, 3:117137.Google Scholar
Kobayashi, T., and Hamada, T. 1974. Silurian trilobites of Japan in comparison with Asian, Pacific, and other faunas. Palaeontological Society of Japan, Special Papers, 18, 155 p.Google Scholar
Kobayashi, T., and Hamada, T. 1985. Additional Silurian trilobites to the Yokokura-Yama fauna from Shikoku, Japan. Transactions and Proceedings of the Palaeontological Society of Japan, 139:206217.Google Scholar
Kobayashi, T., and Hamada, T. 1987. On the Silurian trilobite fauna of Hitoegane near Fukuji in the Hida Plateau, Japan. Transactions and Proceedings of the Palaeontological Society of Japan, 147:131145.Google Scholar
Kobayashi, T., and Sakagami, S. 1989. A Silurian trilobite from Thailand. Proceedings of the Japan Academy, 65:3133.CrossRefGoogle Scholar
Lane, P. D. 1988. Silurian trilobites from Peary Land, central North Greenland. Grønlands Geologiske Undersøgelse, Rapport, 108:93117.CrossRefGoogle Scholar
Ludvigsen, R., and Tripp, R. P. 1990. Silurian trilobites from the northern Yukon Territory. Royal Ontario Museum, Life Sciences Contributions, 153:159.Google Scholar
Over, D. J., and Chatterton, B. D. E. 1987. Silurian conodonts from the southern Mackenzie Mountains, Northwest Territories, Canada. Geologica et Palaeontogica, 21:149.Google Scholar
Pillet, J., and De Lapparent, A. F. 1970. Description de trilobites ordoviciens, siluriens et devoniens d'Afghanistan. Annales de la Société Géologique du Nord, 89:323333.Google Scholar
Poulsen, C. 1934. The Silurian faunas of North Greenland. I. The fauna of the Cape Schuchert Formation. Meddelelser om Gronland, 72:146.Google Scholar
Ramsköld, L. 1986a. Silurian encrinurid trilobites from Gotland and Dalarna, Sweden. Palaeontology, 29:527575.Google Scholar
Ramsköld, L. 1986b. Pacificurus, new name for Australurus Ramsköld (not Jell and Duncan). Geologiska Föreningens i Stockholm Förhandlingar, 108:380.CrossRefGoogle Scholar
Ramsköld, L., and Chatterton, B. D. E. 1991. Revision and subdivision of the polyphyletic Leonaspis (Trilobita). Transactions of the Royal Society of Edinburgh, Earth Sciences:82.Google Scholar
Reed, F. R. C. 1906. The lower Paleozoic fossils of the northern Shan States, Burma. Memoir of the Geological Survey of India, Palaeontologia Indica, 2, 154 p.Google Scholar
Strusz, D. L. 1980. The Encrinuridae and related trilobite families, with a description of Silurian species from southeastern Australia. Paleontographica A, 168:168.Google Scholar
Thomas, A. T., and Narbonne, G. M. 1979. Silurian trilobites from arctic Canada. Geological Magazine, 116:119.CrossRefGoogle Scholar
Wu, H.-J. 1984. Silurian trilobites from Darhan Mumingan Joint Banner, Inner Mongolia, p. 175184. In Li, W.-G., Rong, J.-Y., and Dong, D.-Y. (eds.), Silurian and Devonian Rocks and Faunas of the Bateaobao Area in Darhan Mumingan Joint Banner, Inner Mongolia. People's Publishing House of Inner Mongolia.Google Scholar
Zhang, W.-T. 1983. On the subfamily Coronocephalinae (Trilobita). Palaeontologia Cathayana, 1:195257.Google Scholar