New Siluro-Devonian Anomalocystitids (Echinodermata, Stylophora) from Bolivia and Canada, and a Reevaluation of Skeletal Homologies in Mitrates B. LefebvreW. I. Ausich OriginalPaper 29 December 2021 Pages: 932 - 965
Evolution, Functional Morphology and Paedomorphism in the Gogiid-Ascocystitid Lineage (Eocrinoidea; Cambrian-Ordovician) R. L. Parsley OriginalPaper 29 December 2021 Pages: 966 - 976
Bolboporites: Interpretation Getting Back on Track V. B. KushlinaS. V. Rozhnov OriginalPaper 29 December 2021 Pages: 977 - 984
Sea Lilies in Spring: Crinoid Diversification during the Early Ordovician T. E. GuensburgJ. SprinkleB. Lefebvre OriginalPaper 29 December 2021 Pages: 985 - 992
Two Coils in the Morphology of Myelodactylids (Crinoidea, Disparida): the Morphogenetic Basis of Their Formation and Adaptation Potential S. V. Rozhnov OriginalPaper 29 December 2021 Pages: 993 - 1012
An Unusual Cladid (Crinoidea, Echinodermata) from the Pennsylvanian of the Staritsa District (Tver Region) G. V. Mirantsev OriginalPaper 29 December 2021 Pages: 1013 - 1018
Sea Lilies of the Genus Bathycrinus (Crinoidea, Bathycrinidae) from the Yap and Palau Trenches A. N. MironovD. ZhangC. Wang OriginalPaper 29 December 2021 Pages: 1019 - 1028
The Axial Complex of Echinoderms Represents the Kidney and Is Homologous to the Hemichordate Heart-Kidney O. V. EzhovaV. V. Malakhov OriginalPaper 29 December 2021 Pages: 1029 - 1038
Traces of Sublethal Injuries in Upper Cretaceous Echinoid Tests from the Vicinity of Volsk (Lower Volga Region) E. A. Kalyakin OriginalPaper 29 December 2021 Pages: 1039 - 1048
Ecological Features of Echinoderm Distribution in the Latorp and Volkhov Regional Stages of the Lower and Middle Ordovician of the Leningrad Region G. A. Anekeeva OriginalPaper 29 December 2021 Pages: 1049 - 1062
A Review on Knowledge and Research of Interstitial Sea Cucumber S. P. WooS. H. TanT. Fujita OriginalPaper 29 December 2021 Pages: 1063 - 1071
