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Primitive stalked echinoderms from the Middle Ordovician (Darriwilian) of Bang Song Tho, Kanchanaburi, western Thailand

Published online by Cambridge University Press:  30 October 2017

CHRISTOPHER R.C. PAUL ,
ARTHUR J. BOUCOT ,
STEPHEN K. DONOVAN ,
REN-BIN ZHAN  and
WATTANA TANSATHIEN
CHRISTOPHER R.C. PAUL
Affiliation:
School of Earth Sciences, University of Bristol, Bristol, UK
ARTHUR J. BOUCOT
Affiliation:
Deceased, formerly Department of Integrative Biology, Oregon State University, Corvallis, Oregon, USA
STEPHEN K. DONOVAN*
Affiliation:
Taxonomy and Systematics Group, Naturalis Biodiversity Center, Postbus 9517, 2300 RA Leiden, The Netherlands
REN-BIN ZHAN
Affiliation:
Nanjing Institute of Geology and Palaeontology, Nanjing, People's Republic of China
WATTANA TANSATHIEN
Affiliation:
Bureau of Paleontological Research and Museum, Department of Mineral Resources, Bangkok, Thailand
*
†Author for correspondence: Steve.Donovan@naturalis.nl
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Abstract

The Middle Ordovician (Darriwilian) echinoderm fauna of Bang Mueang Song Tho, western Thailand (Pha Phum group, Bo Ngam Formation(?)), includes rare thecae, and common thecal ossicles and columnals, and is dominated by ‘cystoids’. Cheirocrinid glyptocystitoids include Cheirocystella sp. (= Echinoencrinites sp. aff. E. senckenbergii (von Meyer) sensu Wolfart), ‘Cheirocrinus’ sp. and Cheirocrinidae incertae sedis. Hemicosmitoids are composed of Paracaryocrinites kochi (Wolfart), ‘Paracaryocrinites’ sp. and Polycosmites sp. cf. P. kaekeli Wolfart. The aristocystitid Sinocystis sp. cf. S. loczyi Reed is the only diploporite. Columnals of Bystrowicrinus (col.) sp. are probably crinoidal. The fullest determination of the echinoderm biodiversity of this site has been obtained using all specimens from single ossicles to articulated thecae. The limited taphonomic data suggests that the echinoderm assemblage is parauthochthonous. Other echinoderms described from coeval deposits in this region include Stichocystis thailandica Wolfart; Heliocrinites sp. aff. H. qualus Bather (probably a Lophotocystis Paul); Gomphocystites? sp. indet. (= trilobite?); Codiacystis sp. aff. C. bohemicus (Barrande) (= bryozoan?); Aristocystis [sic] sp. A of Paul; and [non] Incertae sedis sp. C of Paul (may not be an echinoderm).

Keywords

systematicshemicosmitoidsglyptocystitoidscaryocystitidsdiploporitescolumnals
Type
Original Articles
Information
Geological Magazine , Volume 156 , Issue 1 , January 2019 , pp. 147 - 171
Copyright
Copyright © Cambridge University Press 2017 

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