Hostname: page-component-745bb68f8f-5r2nc Total loading time: 0 Render date: 2025-01-09T03:53:30.906Z Has data issue: false hasContentIssue false
  • English
  • Français

Suture modification by pectinirhomb growth in Lepadocystis decorus, a new species of callocystitid glyptocystitid rhombiferan (Echinodermata) from Illinois

Published online by Cambridge University Press:  14 July 2015

Colin D. Sumrall  and
David T. Carlson
Colin D. Sumrall
Affiliation:
Frederick and Amey Geier Collections and Research Center, Cincinnati Museum Center, 1720 Gilbert Avenue, Cincinnati Ohio 45202
David T. Carlson
Affiliation:
840 Oak Street, Elgin, Illinois 60123,
Get access Rights & Permissions [Opens in a new window]

Abstract

A new species of Late Ordovician callocystitid rhombiferan (Glyptocystitidae), Lepadocystis decorus, is described from the Brainard Shale of north-central Illinois. This species is characterized by five pectinirhombs, open infralateral and lateral plate circlets, and well-developed ridges on the thecal plates. Lepadocystis decorus well illustrates that open vs. closed plate circlets in glyptocystitids can largely be a function of pectinirhomb length and is therefore in part an ontogenetically linked characteristic. Consequently, great care must be taken to assure maturity when using this feature in taxonomy.

Type
Research Article
Information
Journal of Paleontology , Volume 74 , Issue 3 , May 2000 , pp. 487 - 491
Copyright
Copyright © The Paleontological Society 2000

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

Bather, F. A. 1899. A phylogenetic classification of the Pelmatozoa. British Association for the Advancement of Science, Report, 68th Meeting section D (Bristol, 1898):916–923.Google Scholar
Bernard, F. 1895. Éléments de Paléontologie. J. B. Baillière and Fils, Paris, 612 p.Google Scholar
Carpenter, P. H. 1891. On certain points in the morphology of the Cystoidea. Journal of the Linnean Society, Zoology, 24:1–52.CrossRefGoogle Scholar
Jaekel, O. 1899. Stammesgeschichte der Pelmatozoen. Band 1, The-coidea und Cystoidea. J. Springer, Berlin, 442 p.Google Scholar
Kesling, R. V., and Mintz, L. W. 1961. Notes on Lepadocystis moorei (Meek) an Upper Ordovician callocystitid cystoid. University of Michigan Museum of Paleontology Contributions, 17:123–148.Google Scholar
Kolata, D. R., and Graese, A. M. 1983. Lithostratigraphy and depositional environments of the Maquoketa Group (Ordovician) in northern Illinois. Illinois State Geological Survey Circular 528, 49 p.Google Scholar
Sloan, R. E. 1987. Tectonics, biostratigraphy and lithostratigraphy of the Middle and Late Ordovician of the Mississippi Valley, p. 7–20. In Sloan, R. E. (ed.), Middle and Late Ordovician Lithostratigraphy and Biostratigraphy of the Upper Mississippi Valley. Minnesota Geological Survey Report of Investigations 35. Minnesota Geological Survey, St. Paul.Google Scholar
Sprinkle, J. 1982. Cylindrical and Globular Rhombiferans, p. 231–273. In Sprinkle, J. (ed.), Echinoderm Faunas from the Bromide Formation (Middle Ordovician) of Oklahoma. University of Kansas, Lawrence.Google Scholar
Sumrall, C. D., and Sprinkle, J. 1995. Plating and pectinirhombs of the Ordovician rhombiferan Plethoschisma . Journal of Paleontology, 69:772–778.CrossRefGoogle Scholar
Sumrall, C. D., and Sprinkle, J. 1999. Early ontogeny of the glyptocystitid rhombiferan Lepadocystis moorei , p. 409–414. In Carnevali, M. D. C. and Bonasoro, F. (eds.), Echinoderm Research 1998. A. A. Balkema, Rotterdam.Google Scholar
Templeton, J. S., and Willman, H. B. 1963. Champlainian Series (Middle Ordovician) in Illinois. Illinois State Geological Survey Bulletin 89:1–260.Google Scholar