Ontogeny ofHypselocrinus Hoveyi, Mississippian Cladid Crinoid From Indiana

Abstract

A very early juvenile specimen ofHypselocrinus hoveyiwith arms and partial column attached is utilized to examine the growth in this Mississippian advanced cladid crinoid. The aboral cup height of this specimen is 4 mm. In contrast to results reported in previous studies of crinoids,Hypselocrinus hoveyigrew with a combination of allometric and isometric growth. Different plates of the aboral cup grew with a combination of growth modes, and arms grew with allometric growth or relative change in shape that was not strict allometry.