selts

Ptychopariida Swinnerton, 1915

Valik taksonit käsitlevast teaduskirjandusest
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Männil, Ralf 1963. The biostratigraphic subdivision of the Ordovician strata in Western Latvia. ENSV TA Geoloogia Instituudi Uurimused XIII, 41-74.
Thorslund, P. 1930. Über einige neue Trilobiten aus dem älteren Leptænakalk Dalekarliens. Bulletin of the Geological Institutions of the University of Uppsala 22, 299-303.
Eichwald, E. 1860. Lethaea Rossica ou Paléontologie de la Russie. Premier volume. Ancienne Période en deux sections. pp. XIX+1–1657. E. Schweizerbart. DOI:10.5962/bhl.title.52391