Abstract
AbstractThe 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 includeCheirocystellasp. (=Echinoencrinitessp. aff.E. senckenbergii(von Meyer)sensuWolfart), ‘Cheirocrinus’ sp. and Cheirocrinidaeincertae sedis. Hemicosmitoids are composed ofParacaryocrinites kochi(Wolfart), ‘Paracaryocrinites’ sp. andPolycosmitessp. cf.P. kaekeliWolfart. The aristocystitidSinocystissp. cf.S. loczyiReed is the only diploporite. Columnals ofBystrowicrinus(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 includeStichocystis thailandicaWolfart;Heliocrinitessp. aff.H. qualusBather (probably aLophotocystisPaul);Gomphocystites? sp. indet. (= trilobite?);Codiacystissp. aff.C. bohemicus(Barrande) (= bryozoan?);Aristocystis[sic] sp. A of Paul; and [non]Incertae sedissp. C of Paul (may not be an echinoderm).
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