Hostname: page-component-77c89778f8-rkxrd Total loading time: 0 Render date: 2024-07-22T06:18:10.607Z Has data issue: false hasContentIssue false
  • English
  • Français

The lichid trilobite Radiolichas in the Silurian of Arctic Canada and Gotland, Sweden

Published online by Cambridge University Press:  01 May 2009

Jonathan M. Adrain  and
Lars Ramsköld
Jonathan M. Adrain
Affiliation:
Department of Palaeontology, The Natural History Museum, Cromwell Road, London SW7 5BD, UK
Lars Ramsköld
Affiliation:
Palaeontological Museum, University of Uppsala, Norbyvägen 22, S-752 36 Uppsala, Sweden
Get access Rights & Permissions [Opens in a new window]

Abstract

Radiolichas has been a poorly known and exclusively Devonian genus of very limited diversity. Radiolichas raydaviesi sp. nov. and R. davedaviesi sp. nov. are the best-known members of the genus, and extend its stratigraphic and geographic range to the Wenlock of the central Canadian Arctic. A further Silurian occurrence is an unnamed species from the Wenlock Slite Beds of Gotland, Sweden. Radiolichas is most similar to Dicranogmus. Together, the genera lack any of the robust trochurine apomorphies (linear pygidial postaxial ridge, prominent pygidial border, prominent cranidial fossula) and appear to fall outside the phylogenetic structure of that subfamily. They are similar to members of the Tetralichinae, particularly in pygidial features, but lack the composite cranidial lobe characteristic of that subfamily. Their systematic position is presently unresolved.

Type
Research Article
Information
Geological Magazine , Volume 133 , Issue 2 , March 1996 , pp. 147 - 158
Copyright
Copyright © Cambridge University Press 1996

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

Adrain, J. M., 1994. The lichid trilobite Borealarges n. gen., with species from the Silurian of arctic Canada. Journal of Paleontology 68, 1081–99.CrossRefGoogle Scholar
Adrain, J. M., & Edgecombe, G. D., 1995. Balizoma and the new genera Aegrotocatellus and Perirehaedulus: encrinurid trilobites from the Douro Formation (Silurian, Ludlow) of the central Canadian Arctic. Journal of Paleontology 69,736–52.CrossRefGoogle Scholar
Adrain, J. M., & Edgecombe, G. D., In press. Silurian encrinurine trilobites from the central Canadian Arctic. Palaeontographica Canadiana.Google Scholar
Angelin, N. P., 1854. Palaeontologica Scandinavica. I: Crustacea formationis transitionis. Fascicule 2,21–92.Google Scholar
Billings, E., 1865. Palaeozoic fossils. Volume 1. Containing descriptions and figures of new or little known species of organic remains from the Silurian rocks. Geological Survey of Canada, 401 pp.CrossRefGoogle Scholar
Chatterton, B. D. E., Johnson, B. D., & Campbell, K. S. W., 1979. Silicified Lower Devonian trilobites from New South Wales. Palaeontology 22, 799–837.Google Scholar
Chatterton, B. D. E., & Ludvigsen, R., 1976. Silicified Middle Ordovician trilobites from the South Nahanni River area, District of Mackenzie, Canada. Palaeontographica Abt. A 154, 1–106.Google Scholar
Chatterton, B. D. E., & Perry, D. G., 1979. Acanthalomina Prantl & Pribyl, a valid subgenus of the trilobite genus Diacanthaspis . Journal of Paleontology 53, 1327–42.Google Scholar
Hawle, I., & Corda, A. J. C., 1847. Prodrom einer Monographie der böhmischen Trilobiten. Prague. 176 pp.Google Scholar
Holzapfel, E., 1895. Das obere Mitteldevon (Schichten mit Stringocephalus Burtini und Maeaneceras terebratum) in Rheinischen Gebirge. Abhandlungen der preussischen geologische Landesanstalt 16, 1–459.Google Scholar
Larsson, K., 1979. Silurian tentaculitids from Gotland and Scania. Fossils and Strata 11, 1–180.Google Scholar
Lenz, A. C., & Melchin, M. J., 1990. Wenlock graptolite biostratigraphy of the Cape Phillips Formation, Canadian Arctic Islands. Canadian Journal of Earth Sciences 27, 1–13.CrossRefGoogle Scholar
Lenz, A. C., & Melchin, M. J., 1991. Wenlock (Silurian) graptolites, Cape Phillips Formation, Canadian Arctic Islands. Transactions of the Royal Society of Edinburgh: Earth Sciences 82,211–37.CrossRefGoogle Scholar
Lindström, G., 1885. Förteckning på Gotlands siluriska crustacer. Öfversigt af Kongliga Vetenskaps—Akademiens Förhandlingar 42(6), 37–99 [in Swedish].Google Scholar
Lindström, G., 1901. Researches on the visual organs of the trilobites. Kungliga Svenska Vetenskaps—Akademiens Handlingar 34(8), 1–86.Google Scholar
Ludvigsen, R., & Tripp, R. P., 1990. Silurian trilobites from the northern Yukon Territory. Royal Ontario Museum Life Sciences Contributions 153, 1–59.Google Scholar
Maksimova, Z. A., 1974. Pervaya nakhodka devonskikh trilobitov v Mongol’skom Altae i novye dannye o lin’ke fakopid. Trudy Vses. nauchno-issledovatel’skogo geol. Inst. (VSEGEI) 182 (Biostratigraficheskij Sbornik 5), 164–71 [in Russian].Google Scholar
Maksimova, Z. A., 1975. Trilobity. In Kharakteristika fauny pogranizhnykh sloev silura i devona tsentral'nogo Kazakhstana (ed. Menner, V. V.), pp. 119–133. Moscow: Moskovskij gosudarstvennyj universitet, 247 pp. [in Russian].Google Scholar
Novák, O., 1890. Vergleichende Studien an einigen Trilobiten aus dem Hercyn von Bicken, Wildungen, Greifenstein und Böhmen. Paläontologische Abhandlungen (N.F.) 1(3), 1–46.Google Scholar
Perry, D. G., & Chatterton, B. D. E., 1977. Silurian (Wenlockian) trilobites from Baillie-Hamilton Island, Canadian Arctic Archipelago. Canadian Journal of Earth Sciences 14, 285–317.CrossRefGoogle Scholar
Ramsköld, L., 1991. The perforated trilobite Laethoprusia gen. nov., and the phylogeny of Koneprusia and Isoprusia (Odontopleuridae, Koneprusiinae). Transactions of the Royal Society of Edinburgh: Earth Sciences 82, 125–41.CrossRefGoogle Scholar
Raymond, P. E., 1905. Notes on the names Amphion, Harpina and Platymetopus . American Journal of Science (4) 19, 377–8.CrossRefGoogle Scholar
Reed, F. R. C., 1923. The subgenera of Lichas . Geological Magazine 60, 454–62.CrossRefGoogle Scholar
Thomas, A. T., & Holloway, D. J., 1988. Classification and phylogeny of the trilobite order Lichida. Philosophical Transactions of the Royal Society of London. B. Biological Science 321,179–262.Google Scholar
Tripp, R. P., 1957. The classification and evolution of the superfamily Lichacea (Trilobita). Geological Magazine 94, 104–22.CrossRefGoogle Scholar
Whidborne, G. F., 1889. A monograph of the Devonian fauna of the south of England, vol. 1. The fauna of the limestones of Lummaton, Wolborough, Chircombe Bridge and Chudleigh. Monograph of the Palaeontographical Society, pp. 1–46.CrossRefGoogle Scholar
Whittington, H. B., 1961. Silurian Hemiarges (Trilobita) from Cornwallis Island and New York State. Journal of Paleontology 35, 433–44.Google Scholar
Whittington, H. B., 1963. Middle Ordovician trilobites from Lower Head, western Newfoundland. Bulletin of the Museum of Comparative Zoology at Harvard College 129, 1–118.Google Scholar