Ontogeny and life-history strategy of Barycrinus (Crinoidea, Mississippian)

Authors

  • KATHY A. HOLLIS,

  • WILLIAM I. AUSICH


Kathy A. Hollis [hollis.kathy@gmail.com], University of Colorado Museum of Natural History, University of Colorado, Boulder, CO 80309, USA; and William I. Ausich [ausich.1@osu.edu], School of Earth Sciences, 155 South Oval Mall, The Ohio State University, Columbus, OH 43210, USA, manuscript received on 5/11/2007; manuscript accepted on 3/3/2008.

Abstract

Discovery of an encrusting juvenile holdfast assigned to the Mississippian crinoid Barycrinus demonstrates that this stalked crinoid had a complex life history. The free-swimming larva settled to become a hard substratum encrusting juvenile, which broke free to become a free-living adult rooted into an unconsolidated substratum. Furthermore, additional small, encrusting holdfast types suggest that this was a common life-history strategy among Mississippian crinoids and, perhaps, blastoids.

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