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Unusual ambulacral branching pattern in a new Ordovician giant edrioasteroid, Bizarroglobus

Published online by Cambridge University Press:  28 April 2015

Colin D. Sumrall  and
James Sprinkle
Colin D. Sumrall
Affiliation:
Department of Earth and Planetary Sciences, University of Tennessee, Knoxville, 37996-1410, USA, 〈csumrall@utk.edu〉
James Sprinkle
Affiliation:
Department of Geological Sciences, Jackson School of Geosciences, University of Texas, 1 University Station C1100, Austin, 78712-0254, USA, 〈echino@jsg.utexas.edu〉
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Abstract

An unusual, new, giant edrioasteroid Bizarroglobus medusae n. gen. n. sp. is described from the Middle Ordovician Kanosh Shale of west-central Utah. This species has a pattern of ambulacral branching with side ambulacra arising alternately from a main ambulacral trunk, previously undocumented in edrioasteroids. This pattern is interpreted as a strategy for allometrically increasing the feeding surface during ontogeny. Bizarroglobus further differs from other isorophid edrioasteroids in the plating of the peripheral rim, and the presence of pores in the interambulacral plates primarily along the edges of the ambulacra.

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Journal of Paleontology , Volume 89 , Issue 2 , March 2015 , pp. 353 - 359
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Copyright © 2015, The Paleontological Society 

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