Subclass
Elasmobranchii Bonaparte, 1838
Selection of related publications
Lebedev, O. A., Ivanov, A. O., Linkevich, V. V. 2020. Chondrichthyan spines from the Famennian (Upper Devonian) of Russia.  Acta Geologica Polonica   70,   3,   339–362. DOI:10.24425/agp.2020.132255
Ivanov, A. O., Plax, D. P. 2018. Chondrichthyans from the Devonian–Early Carboniferous of Belarus.  Estonian Journal of Earth Sciences   67,   1,   43-58. DOI:10.3176/earth.2018.03
Ivanov, A., Märss, T. 2014. New data on Karksiodus (Chondrichthyes) from the Main Devonian Field (East European Platform).  Estonian Journal of Earth Sciences   63,   3,   156-165. DOI:10.3176/earth.2014.14
Ivanov, A., Märss, T., Kleesment, A. 2011. A new elasmobranch Karksiodus mirus gen. et sp. nov. from the Burtnieki Regional Stage, Middle Devonian of Estonia.  Estonian Journal of Earth Sciences   60,   1,   22-30. DOI:10.3176/earth.2011.1.02
Lebedev, O. A., Lukševičs, E., Zakharenko, G. V. 2010. Palaeozoogeographical connections of the Devonian vertebrate communities of the Baltica Province. Part II. Late Devonian.  Palaeoworld   19,   1-2,   108-128. DOI:10.1016/j.palwor.2009.12.003
Karatajūtė-Talimaa, V. N., Märss, T. 1997. Thelodonts from the Silurian and Lower Devonian of Severnaya Zemlya Archipelago, Russian Arctic.  Ichthyolith Issues, Special Publication   3,      13-14.
Märss, T. 1997. Vertebrates of the Pridoli and Silurian-Devonian boundary beds in Europe.  Modern Geology   21,   1,   17-41.
List of species
1. Karksiodus mirus Ivanov et Märss, 2011 | Burtnieki Stage
6. Tamiobatis elgae Ivanov, 2018 | Tournaisian
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Classification
| Organism group | Biota | 
| Kingdom | Animalia | 
| Phylum | Chordata | 
| Subphylum | Vertebrata | 
| Infraphylum | Gnathostomata | 
| Class | Chondrichthyes | 
| Subclass | Elasmobranchii | 
| Order | Ctenacanthiformes | 
| Hybodontiformes | |
| Lamniformes | |
| Lugalepidida | |
| Phoebodontiformes | |
| Superfamily | Protacrodontoidea | 
| Genus | Karksiodus | 
| Order | Acanthodei | 
| Holocephali | |
| Polymerolepidiformes | |
| Family | Kannathalepididae | 
| Palaeospondylidae | |
| Wellingtonellidae | |
| Genus | Karksilepis |