Skip to main content Accessibility help

A new species of the dual-mouthed paracrinoid Bistomiacystis and a redescription of the Edrioasteroid edrioaster priscus from the Upper Ordovician Curdsville Member of the Lexington Limestone

  • Colin D. Sumrall (a1) and Bradley Deline (a2)


Echinoderms are important faunal components in the Curdsville Member of the Lexington Limestone. Numerous clades are represented, including Crinoidea (Springer, 1911; Parsley, 1981), Paracrinoidea (Parsley and Mintz, 1975; Parsley, 1981), Cyclocystoidea (undescribed), Edrioasteroidea (Miller and Gurley, 1894; Bell, 1976, 1979), and Stylophora (Parsley, 1981, 1991). Although some of these taxa are well preserved (Springer, 1911), most have been recovered from residues of acidized samples. These later specimens are poorly preserved, obscuring much of the information. Here we describe well preserved specimens recently collected by members of the Kentucky Paleontological Society (Lexington) of two species that add significantly to our understanding of lesser known components of the Curdsville Fauna. Bistomiacystis schrantzi n. sp. is a large paracrinoid bearing two separate ambu1acral systems that lead to two peristomial openings. Our research suggests that this unusual arrangement is consistent with oral areas of other derived blastozoans bearing oral plates. Edrioaster priscus (Miller and Gurley) is a poorly known large edrioasterid edrioasteroid previously known only from specimens preserved in coarse beekite. The new material of this taxon allows for a thorough characterization of this poorly known edrioasteroid and shows that previous assessments of its size and morphology need revision.



Hide All
Bassler, R. S. 1915. Bibliographic index of American Ordovician and Silurian fossils. U.S. National Museum Bulletin, 92, 1521 p.
Bassler, R. S. 1935. The classification of the Edrioasteroidea. Smithsonian Miscellaneous Collections, 93:111.
Bassler, R. S. and Moodey, M. W. 1943. Bibliographic and faunal index of Paleozoic pelmatozoan echinoderms. Geological Society of America Special Paper 45, 743 p.
Bather, F. A. 1898. Dinocystis barroisi, n. g. et sp., Psammites du Condroz. Geological Magazine, 5:543548.
Bather, F. A. 1914. The Edrioasters of the Trenton Limestone. Geological Magazine, 1:115125,162–171.
Bell, B. M. 1976. A Study of North American Edrioasteroidea. New York State Museum Memoir 21, 446 p.
Bell, B. M. 1979. Edrioasteroids (Echinodermata), p. E1E7. In Pojetta, John (ed.), Contributions to the Ordovician Paleontology of Kentucky and Nearby States. U.S. Geological Survey Professional Paper 1066E.
Bergström, S. M., Finney, S. C., Chen, Xu, Goldman, D., and Leslie, S. A. 2006. Three new Ordovician global stage names. Lethaia, 39:287288.
Billings, E. 1858. On the Asteriadae of the Lower Silurian rocks of Canada. Geological Survey of Canada, figures and descriptions of Canadian organic remains, Decade, 3:7585.
Brett, C. E., Mclaughlin, P. I., Cornell, S. R., and Baird, G. C. 2004. Comparative sequence stratigraphy of two classic Upper Ordovician successions, Trenton Shelf (New York–Ontario) and Lexington Platform (Kentucky–Ohio): Implications for eustasy and local tectonism in eastern Laurentia. Palaeogeography, Palaeoclimatology, Palaeoecology, 210:295329.
Cressman, E. R. 1973. Lithostratigraphy and depositional environments of the Lexington Limestone (Ordovician) of central Kentucky. U.S. Geological Survey Professional Paper 768, 61 p.
Miller, S. A. and Gurley, W. F. E. 1894. New genera and species of Echinodermata. Illinois State Museum Bulletin 5, 53 p.
Parsley, R. L. 1981. Echinoderms from the Middle and Upper Ordovician rocks of Kentucky. U.S. Geological Survey Professional Paper, 1066-K: K1K9.
Parsley, R. L. 1991. Reviews of selected North America mitrrate stylophorans (Homalozoa: Echinodermata. Bulletins of American Paleontology, 100:157.
Parsley, R. L. and Mintz, W. L. 1975. North American Paracrinoidea (Ordovician: Paracrinozoa, new, Echinodermata). Bulletin of American Paleontology, 68:1115.
Regnell, G. 1945. Non-crinoid Pelmatozoa from the Paleozoic of Sweden. Meddelanden från Lunds Geologisk-Mineralogiska Institution, 108:1255.
Regnell, G. 1966. Edrioasteroids, p. U135U173. In Moore, R. C. (ed.), Treatise on Invertebrate Paleontology, Pt. U, Echinodermata 3. University of Kansas and Geological Society of America, Lawrence and Boulder.
Springer, F. 1911. On a Trenton echinoderm fauna at Kirkfield, Ontario. Canada Geological Survey Memoir, 15:301314.
Sprinkle, J. 1973. Morphology and Evolution of Blastozoan Echinoderms. Harvard University Museum of Comparative Zoology, Special Publication, 283 p.
Sprinkle, J. and Parsley, R. L. 1982. “Golf-ball” paracrinoid, p. 224230. In Sprinkle, J. (ed.), Echinoderm Faunas from the Bromide Formation (Middle Ordovician) of Oklahoma. University of Kansas, Lawrence.
Sumrall, C. D. 1993. Thecal designs in isorophinid edrioasteroids. Lethaia, 26:289302.
Sumrall, C. D. 2008. The origin of Lovén's Law in glyptocystitoid rhombiferans and its bearing the plate homology and the heterochronic evolution of the hemicosmitid peristomal border, p. 229242. In Ausich, W. I. and Webster, G. (eds.), Echinoderm Paleobiology. University of Indiana Press, Bloomington.
Sumrall, C. D.In press. A model for elemental homology for the peristome and ambulacra in blastozoan echinoderms. In Harris, L. G., (ed.), Echinoderms Durham, A. A. Balkema, Rotterdam.
Sumrall, C. D. and Wray, G. A. 2007. Ontogeny in the fossil record: Diversification of body plans and the evolution of “aberrant” symmetry in Paleozoic echinoderms. Paleobiology, 33:149163.

Related content

Powered by UNSILO

A new species of the dual-mouthed paracrinoid Bistomiacystis and a redescription of the Edrioasteroid edrioaster priscus from the Upper Ordovician Curdsville Member of the Lexington Limestone

  • Colin D. Sumrall (a1) and Bradley Deline (a2)


Altmetric attention score

Full text views

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

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed.