The works on echinoids by Klein and Leske, the confusion concerning the authorship of Klein (1778), and the problem of citation of some species

Comparing genetic markers’ efficiencies for discrimination between two commercially important holothuroids in the Mediterranean Sea, Holothuria polii and Holothuria sanctori

Dr Claude Massin (25/08/1948—04/09/2021), in Memoriam

A new phosphatized ophiuroid from the lower Triassic of Nevada and its position in the evolutionary history of the Ophiuroidea (Echinodermata)

Attribution of the taxon name Echinodermata to Klein, 1778

Early Miocene stalked crinoids (Echinodermata) from the southern Rhodanian basin (southeastern France). Paleoenvironments and taxonomy

Multiple records and polymorphism of Parastichopus regalis (Cuvier, 1817) (Echinodermata: Holothuroidea: Stichopodidae) along the Algerian coast

Nomenclatural changes in some sea cucumbers with the erection of a new genus and description of a Thyone ?juvenile (?n. sp.) from the Gulf of California (Echinodermata:Holothuroidea:Dendrochirotida)

Four new dendrochirotid holothurians collected from the Seto Inland Sea and the western part of the Sea of Japan, western Japan

Psolidium kharlamenkoi—a new species of holothurian (Holothuroidea: Dendrochirotida: Psolidae) from the Kuril Islands

Catalogue of living crinoids (Echinodermata: Crinoidea) from Brazil

On the taxonomic status of Holothuria (Holothuria) tubulosa (s.s.) from the Algerian coast with the description of a new Mediterranean species, Holothuria (Holothuria) algeriensis n. sp. (Echinodermata: Holothuroidea: Holothuriidae)

New species and occurrence records of Japanese Solasteridae and Ganeriidae including a new species of Paralophaster from the North Pacific with an overview of Hyalinothrix