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Kailidiscus, a new plesiomorphic edrioasteroid from the basal Middle Cambrian Kaili biota of Guizhou Province, China

Published online by Cambridge University Press:  20 May 2016

Yuanlong Zhao ,
Colin D. Sumrall ,
Ronald L. Parsley  and
Jin Peng
Yuanlong Zhao
Affiliation:
College of Resources and Environmental Engineering, Guizhou University, Guiyang, 550003, China, ,
Colin D. Sumrall
Affiliation:
Department of Earth and Planetary Sciences, University of Tennessee, Knoxville, 37996,
Ronald L. Parsley
Affiliation:
Department of Earth and Environmental Sciences, Tulane University, New Orleans, Louisiana, 70118,
Jin Peng
Affiliation:
College of Resources and Environmental Engineering, Guizhou University, Guiyang, 550003, China, ,
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Abstract

A new genus and species of edrioasteroid grade echinoderm, Kailidiscus chinensis, is described from the Kaili Biota of the basal lower Middle Cambrian Kaili Formation from Guizhou Province, China. This echinoderm has a strong resemblance to isorophid edrioasteroids, bearing a well-developed peripheral rim, long curved ambulacra, and slightly imbricate interambulacral plating at maturity. However, the presence of pore-bearing, double biserial floor plates, tiered cover plates, lack of radially positioned oral frame plates, and unincorporated hydropore/gonopore are unknown in isorophids. Many of these features bear strong resemblance to eocrinoids and helicoplacoids, attesting to the plesiomorphic nature of this taxon. Despite the obvious anatomical differences, specimens of this species preserve a complete ontogeny that resembles that of isorophids. Juveniles show a discoidal theca with straight ambulacra that transitions to an inflated theca with strongly curved ambulacra with maturity.

Type
Research Article
Information
Journal of Paleontology , Volume 84 , Issue 4 , July 2010 , pp. 668 - 680
Copyright
Copyright © The Paleontological Society

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