Skip to main content Accessibility help
×
Home

Evolutionary convergence and parallelism in crinoid calyx design

  • William I. Ausich (a1)

Abstract

Eleven basic constructional designs are defined among the Crinoidea. Calyx designs are defined primarily by shape, geometry of plates at the base of the calyx, tegmen shape, fixed calyx plates, number of arms, and nature of radial facets. These calyx designs include the following: multiplated bowls, multiplated bicones, conical mosaics, urns, cylinders, cones, ellipsoids, hands, bowls, bilateral recumbents, and fists. Most crinoid subclasses and orders contain crinoids with several of these designs. This significant convergence and parallelism in calyx design indicates that the morphological evolution of crinoids has been substantially constrained by constructional and fabricational limitations.

Copyright

References

Hide All
Ausich, W. I. 1986a. Palaeoecology and history of the Calceocrinidae (Palaeozoic Crinoidea). Palaeontology, 29:8599.
Ausich, W. I. 1986b. The crinoids of the Al Rose Formation (Lower Ordovician, Inyo County, California, U.S.A.). Alcheringa, 10:217224.
Ausich, W. I., and Bottjer, D. J. 1982. Tiering in suspension-feeding communities on soft substrata throughout the Phanerozoic. Science, 216:173174.
Bottjer, D. J., and Ausich, W. I. 1987. Phanerozoic development of tiering in soft substrata suspension-feeding communities. Paleobiology, 12:400420.
Brett, C. E. 1981. Systematics and paleoecology of Late Silurian (Wenlockian) calceocrinid crinoids from New York and Ontario. Journal of Paleontology, 55:145175.
Brower, J. C. 1966. Functional morphology of Calceocrinidae with descriptions of some new species. Journal of Paleontology, 40:613634.
Brower, J. C. 1973. Crinoids from the Girardeau Limestone (Ordovician). Palaeontographica Americana, 7(46):263499.
Brower, J. C. 1978. Camerates, p. T244T263. In Moore, R. C. and Teichert, K. (eds.), Treatise on Invertebrate Paleontology, Pt. T, Echinodermata 2, Crinoidea. Geological Society of America and University of Kansas Press, Lawrence.
Lane, N. G. 1973. Paleontology and paleoecology of the Crawfordsville fossil site (Upper Osagean: Indiana). University of California Publications in Geological Sciences, 99, 141 p.
Moore, R. C. 1962. Revision of Calceocrinidae. University of Kansas Paleontological Contributions, Echinodermata, Article 4, 40 p.
Moore, R. C., and Teichert, K., (eds.). 1978. Treatise on Invertebrate Paleontology, Pt. T, Echinodermata 2, Crinoidea. Geological Society of America and University of Kansas Press, Lawrence, 1027 p.
Riddle, S. W. 1987. Functional morphology and paleoecological implications of the platycrinitid column (Echinodermata, Crinoidea). Unpubl. M.S. thesis, The Ohio State University, Columbus, 81 p.
SAS User's Guide. 1985. Statistics, version 5 ed. SAS Institute Inc., Cary, North Carolina, 956 p.
Stephenson, D. G. 1980. Symmetry and suspension-feeding in pelmatozoan echinoderms, p. 5358. In Jangoux, M. (ed.), Echinoderms: Present and Past. A. A. Balkema, Rotterdam.

Related content

Powered by UNSILO

Evolutionary convergence and parallelism in crinoid calyx design

  • William I. Ausich (a1)

Metrics

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.