Journal cover Journal topic
Journal of Micropalaeontology An open-access journal of The Micropalaeontological Society
J. Micropalaeontol., 33, 149-163, 2014
https://doi.org/10.1144/jmpaleo2014-008
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 4.0 License.
 
01 Sep 2014
A diverse Upper Darriwilian radiolarian assemblage from the Shundy Formation of Kazakhstan: insights into late Middle Ordovician radiolarian biodiversity
Lauren Pouille1, Taniel Danelian1, and Leonid E. Popov2 1Department of Earth Sciences, University Lille 1, CNRS-UMR 8217 Géosystèmes, Cité Scientifique, SN5, 59655 Villeneuve d’Ascq, France
2Department of Geology, National Museum of Wales, Cathays Park, Cardiff, CF10 3NP
Keywords: Radiolaria, taxonomy, palaeobiodiversity, Darriwilian, Ordovician, Kazakhstan Abstract. A diverse and well-preserved radiolarian assemblage was extracted from a carbonate sample of latest Darriwilian age from the Shundy Formation of the Aksuran Mountain (North Balkhash Region, Kazakhstan). The fauna is represented by 32 species or morphotypes which belong to nine genera, four families and two orders (Spumellaria and Entactinaria), including four new species described herein (Syntagentactinia? angulata n. sp. Pouille & Danelian, Polyentactinia spinulenta n. sp. Pouille & Danelian, Haplotaeniatum circulus n. sp. Pouille & Danelian and H.? giganteum n. sp. Pouille & Danelian). Representatives of the family Inaniguttidae are particularly abundant, representing c. 70% of the studied assemblage, especially genera Triplococcus and Inanihella that dominate the assemblage. Although the studied fauna contains both of the characteristic species and most of the genera of the previously defined Haplentactinia juncta–Inanigutta unica assemblage, differences in the assemblage structure are striking. The studied fauna also establishes that the two characteristic species of the Inanihella bakanasensis–Triplococcus akzhala assemblage are not restricted to the early–mid-Darriwilian, but their age range also extends to the latest Darriwilian.

Citation: Pouille, L., Danelian, T., and Popov, L. E.: A diverse Upper Darriwilian radiolarian assemblage from the Shundy Formation of Kazakhstan: insights into late Middle Ordovician radiolarian biodiversity, J. Micropalaeontol., 33, 149-163, https://doi.org/10.1144/jmpaleo2014-008, 2014.
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