Wright, D. F.; Toom, U. (2017). New crinoids from the Baltic region (Estonia): fossil tip-dating phylogenetics constrains the origin and Ordovician-Silurian diversification of the Flexibilia (Echinodermata). Palaeontology. 60(6): 893-910.
New crinoids from the Baltic region (Estonia): fossil tip-dating phylogenetics constrains the origin and Ordovician-Silurian diversification of the Flexibilia (Echinodermata)