Family
Pycnosteidae Tarlo, 1962
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. 2000. The Middle Devonian fishes of the Baltic States (Estonia, Latvia) and Belarus.  Courier Forschungsinstitut Senckenberg    223,      309-324.
Novitskaya, L. I. 1971. Diagnostic evaluation of ornamentation in Agnatha and Pisces.  Paleontologicheski Zhurnal   1971,   4,   82-96.
Mark-Kurik, E. 1968. New finds of psammosteids (Heterostraci) in the Devonian of Estonia and Latvia.  Eesti NSV Teaduste Akadeemia Toimetised. Keemia, Geoloogia / Известия Академии наук Эстонской ССР. Химия. Геология   17,   4,   409-424. DOI:10.3176/chem.geol.1968.4.11
Preobrazhensky, B. V. 1967. Significance of zonal phenomena in the skeleton of tabulatomorphous corals.  Paleontologicheski Zhurnal   1967,   3,   3-8.
Obruchev, D. V., Mark-Kurik, E. J. (eds) 1965. Devonian psammosteids (Agnatha, Psammosteidae) of the USSR. pp. 1-304.  Eesti NSV TA Geoloogia Instituut. 
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   I,      74-88.
Gross,  W. 1933. Die Fische des baltischen Devons.  Palaeontographica   79,   1-2,   1-74.  E. Schweizerbart. 
List of species
1. Ganosteus artus Mark-Kurik, 1965 | Aruküla Stage
4. Pycnosteus palaeformis Preobrazhensky, 1911 | Aruküla Stage
5. Pycnosteus pauli Mark, 1956 | Aruküla Stage
6. Pycnosteus tuberculatus (Rohon, 1901) | Burtnieki Stage
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Classification
| Organism group | Biota | 
| Kingdom | Animalia | 
| Phylum | Chordata | 
| Subphylum | Vertebrata | 
| Superclass | Agnatha | 
| Class | Pteraspidomorphi | 
| Subclass | Heterostraci | 
| Order | Pteraspidiformes | 
| Suborder | Psammosteida | 
| Family | Drepanaspididae | 
| Guerichosteidae | |
| Obrucheviidae | |
| Psammolepididae | |
| Psammosteidae | |
| Pycnosteidae | |
| Genus | Ganosteus | 
| Pycnolepis | |
| Pycnosteus |