Agnatha

Pycnosteus Preobrazhensky, 1911

Selection of related publications
Märss, T., Kleesment, A., & Niit, M. 2008. Karksilepis parva gen. et sp. nov. (Chondrichthyes) from the Burtnieki Regional Stage, Middle Devonian of Estonia. Estonian Journal of Earth Sciences 57, 4, 219-230. DOI:10.3176/earth.2008.4.02
Mark-Kurik, E. 1968. New finds of psammosteids (Heterostraci) in the Devonian of Estonia and Latvia. Proceedings of the Academy of Sciences of the Estonian SSR. Chemistry and Geology 17, 4, 409-424.
Obruchev, D. & Mark-Kurik, E. 1968. On the evolution of the Psammosteids (Heterostraci). Proceedings of the Academy of Sciences of the Estonian SSR. Geology 17, 3, 279-284.
Mark-Kurik, E. J. 1966. On some injuries of psammosteid exoskeleton (Agnatha). The organism and environment in the geological past. Ed: Hecker, R. F., pp. 55-60.
Obruchev, D. V. & Mark-Kurik, E. J. 1965. Devonian psammosteids (Agnatha, Psammosteidae) of the USSR. Trudy Instituta geologii AN ESSR ?, 1-304.
Halstead Tarlo, L. B. H. 1965. Psammosteiformes (Agnatha) - A review with descriptions of new material from the Lower Devonian of Poland. 2. Systematic part. Palaeontologia Polonica 15, 1-168.
Mark, E. J. 1956. On Genus Pycnosteus (Psammosteidae, Agnatha). Trudy Instituta geologii AN ESSR 1, 74-88.
References based on distribution