Skip to main content
    • Aa
    • Aa

Some disparid crinoids from the Upper Ordovician (Shermanian) Walcott-Rust quarry of New York

  • James C. Brower (a1)

locrinus trentonensis Walcott, 1883 is characterized by the widest food grooves and the largest covering plates of any of the Walcott-Rust Quarry crinoids, which indicates that the animal captured relatively large food particles with large and widely separated tubefeet. Although iocrinids are generally considered as primitive disparids, their anal sac is unique. the holdfasts of I. trentonensis consist of distal stem coils that are tightly wrapped around the columns of other crinoids. the relatively long column of Ectenocrinus simplex (Hall, 1847) was attached to a wide range of shelly substrates by a small irregular and somewhat lobate holdfast. Ectenocrinids ate much smaller food items that were collected by smaller and more tightly packed tubefeet. the ontogeny of E. simplex illustrates the differences between the food gathering systems of conspecific crinoids from shallow and deep water habitats. the calceocrinid Calceocrinus barrandii Walcott, 1883 lived with its long stem forming a runner along the seafloor. the crown was movably hinged to the basal circlet and the stem. Moderately wide food grooves were probably present.

Linked references
Hide All

This list contains references from the content that can be linked to their source. For a full set of references and notes please see the PDF or HTML where available.

W. I. Ausich 1998a. Early phylogeny and subclass division of the Crinoidea (Phylum Echinodermata). Journal of Paleontology, 72:499510.

J. P. Botting 2003. Llanvirn (Middle Ordovician) echinoderms from Llandegley Rocks, central Wales. Palaeontology, 46:685708.

C. E. Brett 1999. Chapter 6, Middle Ordovician Trenton Group of New York, USA, p. 6367. In H. Hess , W. I. Ausich , C. E. Brett , and M. J. Simms (eds.), Fossil crinoids. Cambridge University Press, Cambridge, United Kingdom.

J. C. Brower 2005. The paleobiology and ontogeny of Cincinnaticrinus varibrachialus Warn and Strimple, 1977 from the Middle Ordovician (Shermanian) Walcott-Rust Quarry of New York. Journal of Paleontology, 79: 152174.

J. C. Brower 2006. Ontogeny of the food-gathering system in Ordovician crinoids. Journal of Paleontology, 80:430446.

J. C. Brower 2007. The application of filtration theory to food gathering in Ordovician crinoids. Journal of Paleontology, 81:12841300.

E. Kirk 1914. Notes on the fossil crinoid genus Homocrinus Hall. United States National Museum Proceedings, 46:473483.

D. L. Meyer 1979. Length and spacing of the tube feet in crinoids (Echinodermata) and their role in suspension feeding. Marine Biology, 51:361369.

D. L. Meyer , A. I. Miller , S. M. Holland , and B. F. Dattilo 2002. Crinoid distribution and feeding morphology through a depositional sequence: Kope and Fairview Formations, Upper Ordovician, Cincinnati Arch region. Journal of Paleontology, 76:725732.

M. J. Simms 1993. Reinterpretation of thecal plate homology and phylogeny in the class Crinoidea. Lethaia, 26:303312.

P. H. A. Sneath 1977. A method for testing the distinctness of clusters: a test of the disjunction of two clusters in euclidean space as measured by their overlap. Mathematical Geology, 9:123143.

Recommend this journal

Email your librarian or administrator to recommend adding this journal to your organisation's collection.

Journal of Paleontology
  • ISSN: 0022-3360
  • EISSN: 1937-2337
  • URL: /core/journals/journal-of-paleontology
Please enter your name
Please enter a valid email address
Who would you like to send this to? *


Altmetric attention score

Full text views

Total number of HTML views: 0
Total number of PDF views: 3 *
Loading metrics...

Abstract views

Total abstract views: 24 *
Loading metrics...

* Views captured on Cambridge Core between September 2016 - 19th August 2017. This data will be updated every 24 hours.