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

Colin D. Sumrall; James Sprinkle

doi:10.1017/jpa.2014.30

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Colin D. Sumrall,¹ James Sprinkle²

¹Department of Earth and Planetary Sciences, University of Tennessee, Knoxville, 37996-1410, USA, ⟨ ⟩ csumrall@utk.edu
²Department of Geological Sciences, Jackson School of Geosciences, University of Texas, 1 University Station C1100, Austin, 78712-0254, USA, ⟨ ⟩ echino@jsg.utexas.edu

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.

Citation Download Citation

Colin D. Sumrall and James Sprinkle "Unusual ambulacral branching pattern in a new Ordovician giantedrioasteroid, Bizarroglobus," Journal of Paleontology 89(2), 353-359, (1 March 2015). https://doi.org/10.1017/jpa.2014.30

Accepted: 1 July 2014; Published: 1 March 2015

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