Agnatha

Pycnosteus Preobrazhensky, 1911

Selection of related publications
Märs, T., Kleesment, A., Niit, M. 2008. Karksilepisparva 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
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. 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.
Mark-Kurik, E. J. 1966. On some injuries of psammosteid exoskeleton (Agnatha). The organism and environment in the geological past, pp. 55-60.
Obruchev, D. V., Mark-Kurik, E. J. (eds) 1965. Devonian psammosteids (Agnatha, Psammosteidae) of the USSR.
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). ENSV TA Geoloogia Instituudi uurimused 1, 74-88.
References based on distribution