Abstract
New data on the placoderm fish Plourdosteus livonicus (Eastman, 1896) from the Lower Frasnian deposits of the Mikhaylovsky Mine in the Kursk Region is described. These remains are currently housed at the Earth Science Museum of Lomonosov Moscow State University. The medio-dorsal plate from this locality allows reconstructing its form and proportion, as also early unknown anterior division of the bone. Only small fragments of medio-dorsal plates were formerly described and figured for P. livonicus from this and other localities in European Russia. So, the new data from the Mikhaylovsky Mine adds to the morphology information of this species. The medio-dorsals are of diagnostic significance and distinguish in the plourdosteids. The specimen from the Earth Science Museum’s collection is compared with the medio-dorsal plates of other Frasnian Plourdosteus species from the East-European platform.
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