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.
Preobrazhensky, B. V. 1967. The significance of the zonal phenomena in Tabulate coral skeleton. Paleontologicheski Zhurnal , 3, 3-8.
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