First report of Silurian crinoid columnals with tetralobate and hexalobate lumen structures

Two specimens of crinoid columnals with previously undocumented lumen morphologies are described from Silurian (Wenlock) strata of the Cincinnati Arch region, eastern-midcontinent North America. An attachment structure with a prominent tetralobate lumen, the first tetralobate lumen in a columnal rep...

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Bibliographic Details
Published in:GFF 2014-01, Vol.136 (1), p.266-269
Main Authors: Thomka, James R., Motz, Gary J.
Format: Article
Language:English
Subjects:
Crinoidea
Echinodermata
Eucalyptocrinites
holdfast
Wenlock
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Summary:Two specimens of crinoid columnals with previously undocumented lumen morphologies are described from Silurian (Wenlock) strata of the Cincinnati Arch region, eastern-midcontinent North America. An attachment structure with a prominent tetralobate lumen, the first tetralobate lumen in a columnal reported from the Silurian, was recovered from a microbioherm in the Massie Formation of southeastern Indiana. An isolated columnal ossicle with a large hexalobate lumen, the first hexalobate lumen-bearing columnal documented, was recovered from a skeletal dolowackestone in the Lilley Formation of southwestern Ohio. These discoveries significantly increase the disparity of the otherwise morphologically conservative Silurian crinoid-columnal fauna.
ISSN:1103-5897
2000-0863
DOI:10.1080/11035897.2013.854271