Trilobita

Ptychopyge Angelin, 1854

Selection of related publications
Balashova, E. A. 1964. Morfologiâ, filogeniâ i stratigrafičeskoe značenie ranneordovikskogo podsemejstva Ptychopyginae Pribaltiki. Voprosy paleontologii IV, 3-56. Voprosy paleontologii, IV, pp. 3-56.
References based on distribution