Ptychopariida Swinnerton, 1915

Selection of related publications
Rasmussen, B. W., Nielsen, A. T., Schovsbo, N. H. 2015. Faunal succession in the upper Cambrian (Furongian) Leptoplastus Superzone at Slemmestad, southern Norway. Norwegian Journal of Geology 95, 1, 1-22. DOI:10.17850/njg95-1-01
Żylińska, A., Weidner, T., Ahlgren, J., Ahlberg, P. 2015. Exotic trilobites from the uppermost Cambrian Series 3 and lower Furongian of Sweden. Acta Geologica Polonica 65, 1, 21-67. DOI:10.1515/agp-2015-0002
Pärnaste, H., Bergström, J. 2013. The asaphid trilobite fauna: Its rise and fall in Baltica. Palaeogeography, Palaeoclimatology, Palaeoecology 389, 64-77. DOI:10.1016/j.palaeo.2013.06.007
Pärnaste, H., Bergström, J., Zhou, Z.-Y. 2013. High-resolution trilobite stratigraphy of the Lower-Middle Ordovician Öland Series of Baltoscandia. Geological Magazine 150, 3, 509–518. DOI:10.1017/S0016756812000908
Bird, C., Clarkson, E. 2003. Observations on the ontogeny of the upper Cambrian trilobite Peltura scarabaeoides westergaardi Henningsmoen, 1957. GFF 125, 4, 177-190. DOI:10.1080/11035890301254177
Balashova, E. A., Korkutis, V. A. 1970. On the first find of the Upper Cambrian trilobite in the Tyskre suite of the Baltic area. Palaeontology and Stratigraphy of the Baltic and the Byelorussia. Number II, pp. 341-344.
Männil, Ralf 1963. The biostratigraphic subdivision of the Ordovician strata in Western Latvia. ENSV TA Geoloogia Instituudi uurimused XIII, 41-74. ENSV Teaduste Akadeemia Geoloogia Instituudi Uurimused XIII, pp. 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. DOI:10.5962/bhl.title.52391