The latest Devonian (Famennian) phacopid trilobite Omegops from eastern Alborz, Iran

The Late Devonian (late Famennian) phacopid trilobites represented by Omegops tilabadensis sp. nov. are described and illustrated from the Khoshyeilaq Formation, eastern Alborz Mountains, North Iran. The species formed a monotaxic trilobite association inhabiting a shallow shelf together with divers...

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Bibliographic Details
Published in:Estonian journal of earth sciences 2018-09, Vol.67 (3), p.192-204
Main Authors: Pour, Mansoureh Ghobadi, Popov, Leonid E, Omrani, Mehdi, Omrani, Hadi
Format: Article
Language:English
Subjects:
Devonian
Devonian period
Fossil animals
Fossils
Geology
Marine invertebrates
Morphology
Mountains
Museums
Natural history
New species
Trilobites
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Summary:The Late Devonian (late Famennian) phacopid trilobites represented by Omegops tilabadensis sp. nov. are described and illustrated from the Khoshyeilaq Formation, eastern Alborz Mountains, North Iran. The species formed a monotaxic trilobite association inhabiting a shallow shelf together with diverse brachiopod communities dominated by the athyridides and spiriferides. Constant differences in pygidial morphology between the geographically separated Omegops species from the Middle East, Northwest China (Junggar) and West Europe plus the North African sector of Gondwana may suggest the existence of two geographically isolated Omegops lineages which diverged in pre-Strunian time. The occurrence of conodonts not older than the Bispathodus costatus Zone and the brachiopod Rhipidomella michelini gives a sufficient proof of the Strunian to early Tournaisian age of the uppermost part of the Khoshyeilaq Formation.
ISSN:1736-4728
1736-7557
DOI:10.3176/earth.2018.16