Hostname: page-component-848d4c4894-cjp7w Total loading time: 0 Render date: 2024-06-16T20:38:40.358Z Has data issue: false hasContentIssue false
  • English
  • Français

Silicified Lichidae (Trilobita) from the Middle Ordovician of Virginia

Published online by Cambridge University Press:  01 May 2009

R. P. Tripp  and
W. R. Evitt
R. P. Tripp
Affiliation:
The British Museum (Natural History), Cromwell Road, London SW7 5BD
W. R. Evitt
Affiliation:
Stanford University, Stanford, California, U.S.A.
Get access Rights & Permissions [Opens in a new window]

Summary

The trilobite family Lichidae is represented in the Middle Ordovician of Virginia by silicified remains of species of Hemiarges and Amphilichas. One new subspecies, Hemiarges turneri Chatterton & Ludvigsen rasettii, is described. Development stages of both genera are illustrated. The bulla of H. turneri rasettii appears in the meraspis, whereas it is present in the protaspis of a Devonian species. The late metaprotaspis of Amphilichas has a small fixigenal spine, a feature shared with protaspides of the family Odontopleuridae.

Type
Articles
Information
Geological Magazine , Volume 118 , Issue 6 , November 1981 , pp. 665 - 677
Copyright
Copyright © Cambridge University Press 1981

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

Beecher, C. E. 1893. Larval forms of Trilobites from the Lower Helderberg group. Am. J. Sci. ser. 3, 46, 142–7, pl. 2.CrossRefGoogle Scholar
Billings, E. 1865. Geological Survey of Canada – New Species of Palaeozoic Fossils, pp. 169–344.Google Scholar
Chatterton, B. D. E. 1971. Taxonomy and ontogeny of Siluro-Devonian trilobites from near Yass, New South Wales. Palaeontographica A, 137, 1–108, pl. 1–24.Google Scholar
Chatterton, B. D. E. & Ludvigsen, R. 1976. Silicified Middle Ordovician trilobites from the South Nahanni River Area, District of Mackenzie. Palaeontographica A, 154, 1–106, pl. 1–22.Google Scholar
Evitt, W. R. 1951. Some Middle Ordovician Trilobites of the families Cheiruridae, Harpidae and Lichidae. J. Paleont. 25, 587–616, pls 85–8.Google Scholar
Gürich, G. 1901. Über eine neue Lichas-Art aus dem Devon von Neu-Süd-Wales und über die Gattung Lichas uberhaupt. Neues Jb., Beil.-Bd. 14, 519–39, pl. 20.Google Scholar
Hawle, I. & Corda, A. J. C. 1847. Prodrom einer Monographie der böhmischen Trilobiten, pp. 1–176, pl. 1–7. Prague.Google Scholar
Hu, Chung-Hung. 1974. Ontogenies of two Middle Ordovician trilobites from the Edinburg Formation, Virginia. Trans. Proc. Palaeont. Soc. Japan, N.S. 95, 353–63, pls 48–49.Google Scholar
Raymond, P. E. 1905. Note on the Names Amphion, Harpina, and Platymetopus. Am. J. Sci. ser. 4, 19, 377–8.Google Scholar
Raymond, P. E. 1925. Some trilobites of the lower Middle Ordovician of eastern North America. Mus. Comp. Zool. Harv., lxvii, 1–180, pls 1–10.Google Scholar
Reed, F. R. C. 1902. Notes on the genus Lichas. Q. Jl geol. Soc. 58, 59–82.CrossRefGoogle Scholar
Shaw, F. C. 1968. Early Middle Ordovician Chazy trilobites of New York. Mem. N.Y. St. Mus. nat. hist. sci. Serv. 17, 1–163, pls 1–24.Google Scholar
Sdzuy, K. 1979. Two rare trilobites from the Tremadoc Leimitz Shales, Germany. Alcheringa. 3, 63–72, figs 1–5.CrossRefGoogle Scholar
Temple, J. T. 1969. Lower Llandovery (Silurian) trilobites from Keisley, Westmorland. Bull. Br. Mus. nat. Hist. (Geol.), 18, 197–230, pls 1–6.Google Scholar
Temple, J. T. 1972. Essay Review: Ontogenies of Devonian trilobites from New South Wales. Geol. Mag. 109, 373–6.CrossRefGoogle Scholar
Whittington, H. B. 1956. Beecher's lichid protaspis and Acanthopyge consanguinea (Trilobita). J. Paleont. 30, 1200–4, pl. 131.Google Scholar
Whittington, H. B. & Evitt, W. R. 1954. Silicified Middle Ordovician trilobites. Mem. geol. Soc. Amer. 59, 1–137, pls 1–33.Google Scholar