Hostname: page-component-848d4c4894-5nwft Total loading time: 0 Render date: 2024-04-30T16:47:26.259Z Has data issue: false hasContentIssue false
  • English
  • Français

A flexible crinoid from the Llandovery (Silurian) of western Ireland

Published online by Cambridge University Press:  14 July 2015

Stephen K. Donovan ,
Eamon N. Doyle  and
David A. T. Harper
Stephen K. Donovan
Affiliation:
1Department of Geology, University of the West Indies, Mona, Kingston 7, Jamaica
Eamon N. Doyle
Affiliation:
1Department of Geology, University of the West Indies, Mona, Kingston 7, Jamaica
David A. T. Harper
Affiliation:
2Department of Geology, University College, Galway, Ireland
Get access Rights & Permissions [Opens in a new window]

Abstract

“Complete” crinoids are rare fossils in the lower Paleozoic of Ireland. Cryptanisocrinus kilbridensis n. gen. and sp., from the Upper Llandovery (Telychian) Finny School Beds of the upper Kilbride Formation, County Mayo, is an anisocrinine homalocrinid and the first Irish lower Paleozoic flexible crinoid. The unique holotype is an external mold without counterpart that does not retain the anal series. Cryptanisocrinus kilbridensis has a kylixiform dorsal cup, a low but prominent, infrabasal circlet, low, triangular basals, arms that branch isotomously at least three times, and two interprimibrachial plates in each interray, the lower of which is the larger.

Type
Research Article
Information
Journal of Paleontology , Volume 66 , Issue 2 , March 1992 , pp. 262 - 266
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. 1878. Iconographia crinoideorum in stratis Sueciae Siluricis fossilium. Samson and Wallin, Holmiae. [Not seen.] Google Scholar
Donovan, S. K. 1985a. The Ordovician crinoid Trochocrinites laevis Portlock, 1843. Irish Journal of Earth Sciences, 6:121–126.Google Scholar
Donovan, S. K. 1985b. A cladid inadunate crinoid from the Ordovician Tramore Limestone of Co. Waterford. Irish Journal of Earth Sciences, 7:9–13.Google Scholar
Donovan, S. K. 1986. Pentameric pelmatozoan columns from the Arenig Tourmakeady Limestone, Co. Mayo. Irish Journal of Earth Sciences, 7:93–97.Google Scholar
Donovan, S. K. 1989. Pelmatozoan columnals from the Ordovician of the British Isles, Part 2. Monograph of the Palaeontographical Society, London, 142(580):69–114.CrossRefGoogle Scholar
Donovan, S. K. 1991. The taphonomy of echinoderms: calcareous multi-element skeletons in the marine environment, p. 241–269. In Donovan, S. K. (ed.), The Processes of Fossilization. Belhaven Press, London.Google Scholar
Donovan, S. K., and Clark, N. D. L. In press. Unusual crinoid columnals from the Llandovery of Scotland and Wales. Palaeontology.Google Scholar
Donovan, S. K., and Sevastopulo, G. D. 1989. Myelodactylid crinoids from the Silurian of the British Isles. Palaeontology, 32:689–710.Google Scholar
Doyle, E. N., Harper, D. A. T., and Parkes, M. A. 1990. The Tonalee fauna: a deep water shelly assemblage from the Llandovery rocks of the west of Ireland. Irish Journal of Earth Sciences, 10:127–143.Google Scholar
Doyle, E. N., Hoey, A. N., and Harper, D. A. T. 1991. The brachiopod Eocoelia from the Upper Llandovery of Ireland and Scotland: a refinement of the Eocoelia lineage. Palaeontology, 34:439–454.Google Scholar
Frest, T. J., and Strimple, H. L. 1978. The flexible crinoid genus Anisocrinus (Ordovician–Silurian) in North America. Journal of Paleontology, 52:683–696.Google Scholar
Gardiner, C. I., and Reynolds, S. H. 1912. The Ordovician and Silurian rocks of the Kilbride Peninsula (Mayo). Quarterly Journal of the Geological Society of London, 68:75–102.CrossRefGoogle Scholar
Kinahan, G. H., and Nolan, J. 1870. Explanatory memoir to accompany sheet 95. Memoirs of the Geological Survey of Ireland, 72 p.Google Scholar
Kinahan, G. H., Leonard, H., and Cruise, R. J. 1878. Explanatory memoir to accompany sheets 93 and 94 with adjoining portions of sheets 83, 84 and 103. Memoirs of the Geological Survey of Ireland, 177 p.Google Scholar
McKerrow, W. S., and Campbell, C. J. 1960. The stratigraphy and structure of the Lower Palaeozoic rocks of north-west Galway. Scientific Proceedings of the Royal Dublin Society, A1:27–52.Google Scholar
Miller, J. S. 1821. A natural history of the Crinoidea or lily-shaped animals, with observations on the genera Asteria, Eurayle, Comatula and Marsupites . Bryan and Co., Bristol, 150 p.Google Scholar
Moore, R. C. 1978. Flexibilia, p. T759–T812. In Moore, R. C. and Teichert, C. (eds.), Treatise on Invertebrate Paleontology, Part T, Echinodermata 2(2). Geological Society of America and University of Kansas Press, Lawrence.Google Scholar
Moore, R. C., Jeffords, R. M., and Miller, T. H. 1968. Morphological features of crinoid columns. The University of Kansas Paleontological Contributions, Echinodermata, Article 8:1–30.Google Scholar
Paul, C. R. C. 1986. Seriation as a technique in palaeoecology. Abstracts, Palaeontological Association Annual Conference, Leicester, 18–21 December:18–19.Google Scholar
Piper, D. J. W. 1967. A new interpretation of the Llandovery sequence of north Connemara, Eire. Geological Magazine, 104:253–267.CrossRefGoogle Scholar
Piper, D. J. W. 1972. Sedimentary environments and palaeogeography of the late Llandovery and earliest Wenlock of north Connemara, Ireland. Journal of the Geological Society of London, 128:33–51.Google Scholar
Portlock, J. E. 1843. Report on the geology of the County of Londonderry and of parts of Tyrone and Fermanagh. A. Milliken, Dublin, 784 p.Google Scholar
Ramsbottom, W. H. C. 1954. The British Lower Palaeozoic Crinoidea. Unpubl. , University of London, 290 p.Google Scholar
Ramsbottom, W. H. C. 1958. British Upper Silurian crinoids from the Ludlovian. Palaeontology, 1:106–115.Google Scholar
Ramsbottom, W. H. C. 1961. The British Ordovician Crinoidea. Monograph of the Palaeontographical Society, London, 114(492):1–37.Google Scholar
Rickards, R. B. 1973. On some highest Llandovery red beds and graptolite assemblages in Britain and Eire. Geological Magazine, 110:70–72.Google Scholar
Springer, F. 1913. Class 3. Crinoidea Miller. Sea-lilies, p. 173–243. In von Zittel, K. A. (transl. and ed. by Eastman, C. R.), Text-book of Paleontology. MacMillan, London.Google Scholar
Springer, F. 1920. The Crinoidea Flexibilia. Smithsonian Institution, Publication 2501, 486 p.Google Scholar
Ubaghs, G. 1978. Skeletal morphology of fossil crinoids, p. T58–T216. In Moore, R. C. and Teichert, C. (eds.), Treatise on Invertebrate Paleontology, Part T, Echinodermata 2(1). Geological Society of America and University of Kansas Press, Lawrence.Google Scholar
Warn, J., and Strimple, H. L. 1977. The disparid inadunate super-families Homocrinacea and Cincinnaticrinacea (Echinodermata: Crinoidea), Ordovician–Silurian, North America. Bulletins of American Paleontology, 72(296):1–138.Google Scholar
Webster, G. D. 1974. Crinoid pluricolumnal noditaxis patterns. Journal of Paleontology, 48:1283–1288.Google Scholar
Williams, D. M., and Harper, D. A. T. 1988. A basin model for the Silurian of the Midland Valley of Scotland and Ireland. Journal of the Geological Society of London, 145:741–748.CrossRefGoogle Scholar
Ziegler, A. M. 1965. Silurian submarine communities and their environmental significance. Nature, 207:270–272.Google Scholar
Ziegler, A. M., Cocks, L. R. M., and Bambach, R. K. 1968. The composition and structure of Lower Silurian marine communities. Lethaia, 1:1–27.Google Scholar
Zittel, K. A. von. 1895. Grundzüge der Palaeontologie (Palaeozoologie). R. Oldenbourg, München. [Not seen.] Google Scholar