Echinodermata

Haplosphaeronis Jaekel, 1926

Selection of related publications
Sheffield, S. L., Sumrall, C. D. 2019. The phylogeny of the Diploporita: a polyphyletic assemblage of blastozoan echinoderms. Journal of Paleontology 93, 04, 740-752. DOI:10.1017/jpa.2019.2
Bockelie, J. F. 1984. The Diploporita of the Oslo region, Norway. Palaeontology 27, 1, 1-68.
Regnéll, G. 1945. Non-Crinoid Pelmatozoa from the Paleozoic of Sweden. A taxonomic study. Meddelanden från Lunds Geologisk-Mineralogiska Institution 108, 1-255.
Jaekel, O. 1899. Stammesgesihichte der Pelmatozoen. Erster Band. Thecoidea und Cystoidea.