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Journal of Paleontology; May 2000; v. 74; no. 3; p. 487-491; DOI: 10.1666/0022-3360(2000)074<0487:SMBPGI>2.0.CO;2
© 2000 Paleontological Society
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SUTURE MODIFICATION BY PECTINIRHOMB GROWTH IN LEPADOCYSTIS DECORUS, A NEW SPECIES OF CALLOCYSTITID GLYPTOCYSTITID RHOMBIFERAN (ECHINODERMATA) FROM ILLINOIS

COLIN D. SUMRALL1 and DAVID T. CARLSON1

1 Frederick and Amey Geier Collections and Research Center, Cincinnati Museum Center, 1720 Gilbert Avenue, Cincinnati, Ohio 45202, Colin.Sumrall{at}UC.EDU and 840 Oak Street, Elgin, Illinois 60123, fossil54{at}worldnet.att.net

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.




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R. L. PARSLEY and C. D. SUMRALL
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Journal of Paleontology, November 1, 2007; 81(6): 1486 - 1493.
[Abstract] [Full Text] [PDF]

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CHEIROCYSTIS FULTONENSIS, A NEW GLYPTOCYSTITOID RHOMBIFERAN FROM THE UPPER ORDOVICIAN OF THE CINCINNATI ARCH--COMMENTS ON CHEIROCRINID ONTOGENY
Journal of Paleontology, September 1, 2002; 76(5): 843 - 851.


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A REVISION OF NOVACYSTIS HAWKESI PAUL AND BOLTON 1991 (MIDDLE SILURIAN: GLYPTOCYSTITIDA, ECHINODERMATA) AND THE PHYLOGENY OF EARLY CALLOCYSTITIDS
Journal of Paleontology, July 1, 2002; 76(4): 733 - 740.



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