Alternognathus is an extinct conodont genus in the family Elictognathidae. An extensive study on its population dynamics and lifespan has recently been published.Przemysław Świś (2019). "Population dynamics of the Late Devonian conodont Alternognathus calibrated in days". Historical Biology: An International Journal of Paleobiology. in press. doi:10.1080/08912963.2018.1427088.
References
Important candidate sections for stratotype of conodont based Devonian-Carboniferous boundary. Willi Ziegler and Charles A. Sandberg, Courier Forschungsinstitut Senckenberg, 1984 Palmatolepis-based revision of upper part of standard Late Devonian conodont zonation. Willi Ziegler and Charles A. Sandberg, GSA Special Papers, 1984, volume 196, pages 179–194,
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