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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,
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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

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