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A low diversity shallow water lingulide brachiopod-gastropod association from the Upper Ordovician Almaly Formation of North Kyrgyzstan
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Palaeobiology.
2007 (English)In: Acta Paleontologica Polonica, ISSN 0567-7920, Vol. 52, no 1, 27-40 p.Article in journal (Refereed) Published
Abstract [en]

A low diversity association made up of the lingulid Tunisiglossa almalensis Popov and Mambetov, sp. nov. and the gas−tropod Ptychonema agyris Ebbestad, sp. nov. is described from the Upper Member of the Almaly Formation at KyrgyzRange, North Tien Shan, Kyrgyzstan/Kazakhstan. The specimens co−occur in dense coquinas, made up of different sizedindividuals, deposited in a shallow water, intertidal, and storm driven depositional environment. The lingulid shells dis−play a completely reduced dorsal pseudointerarea typical of Glossellinae, and the smooth shell lacking fine external gran−ulation, radial or pitted ornament, a small ventral pseudointerarea, and no dorsal median ridge place it in the hithertomonotypic Tunisiglossa known previously only from the Lower Ordovician (Tremadocian) Sanrhar Formation of Libya.It compares with Ectenoglossa sorbulakensis that is widespread in the lower to middle Caradocian Anderken Formationof Chu−Ili Range in southern Kazakhstan. Gastropods of this age have not been reported earlier in Kyrgyzstan; neither canPtychonema be compare with any taxon in the gastropod association earlier described from the contemporary AnderkenFormation in Kazakhstan. Ptychonema is otherwise commonly associated with peri−Gondwana terranes, but the Late Or−dovician dispersal pattern of the genus is unknown. Overall, however, the Upper Ordovician faunas of North Tien Shanshow close similarities to contemporaneous faunas of the Chu−Ili terrane, which have strong biogeographic signatureslinking them to the faunas of South and North China.

Place, publisher, year, edition, pages
2007. Vol. 52, no 1, 27-40 p.
Keyword [en]
Brachiopoda, Gastropoda, Lingulida, Ordovician, Kazakhstan, Kyrgyzstan, Almaly Formation, palaeobio− geography, North Tien Shan.
National Category
Earth and Related Environmental Sciences
URN: urn:nbn:se:uu:diva-10668OAI: oai:DiVA.org:uu-10668DiVA: diva2:38436
Available from: 2007-05-21 Created: 2007-05-21 Last updated: 2015-01-13Bibliographically approved

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Ebbestad, Jan Ove R.
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