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Morphologic and systematic revision of the solute Maennilia estonica (Homoiostelea, Echinodermata) from the Upper Ordovician of Estonia

Published online by Cambridge University Press:  20 May 2016

Ronald L. Parsley ,
Sergei V. Rozhnov  and
Colin D. Sumrall
Ronald L. Parsley
Affiliation:
Department of Earth and Environmental Sciences, Tulane University, New Orleans, Louisiana 70118, USA,
Sergei V. Rozhnov
Affiliation:
Borissiak Paleontological Institute, Russian Academy of Sciences, Profsoyuznaya 123, 117997, Moscow, Russia,
Colin D. Sumrall
Affiliation:
Department of Earth and Planetary Sciences, University of Tennessee, Knoxville, Tennessee 37996, USA,
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Abstract

Maennilia estonica Rozhnov and Jefferies was first described as a stem-chordate but restudy shows it is an unusually large homoiostelean echinoderm. Its feeding structure, an erect ambulacrum, extending exothecally from the peristomial frame plates, bears a large internal tunnel that opens directly into the body cavity. This type of feeding appendage is now recognized to be unique to homoiosteles. It bears no evidence for water vascular system impressions adjacent to its food groove. The theca has poorly developed marginal plates and a narrow rim that, in contrast to some other homoiosteles, does not extend over either lower or upper thecal face. Maennilia appears to have inhabited the deeper portions of a near-shore environment in limey muds adjacent to a linear zone of bryozoan and microbial bioherms.

Type
Research Article
Information
Journal of Paleontology , Volume 86 , Issue 3 , May 2012 , pp. 462 - 469
Copyright
Copyright © The Paleontological Society 

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