Trilobita
perekond

Ptychopyge Angelin, 1854

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Valik taksonit käsitlevast teaduskirjandusest
Balashova, E. A. 1964. Morfologiâ, filogeniâ i stratigrafičeskoe značenie ranneordovikskogo podsemejstva Ptychopyginae Pribaltiki. Voprosy paleontologii IV, 3-56.