''Calclamna'' is an extinct genus of

sea cucumber Sea cucumbers are echinoderms from the class Holothuroidea (). They are marine animals with a leathery skin and an elongated body containing a single, branched gonad. Sea cucumbers are found on the sea floor worldwide. The number of holothu ...

which existed in

Europe Europe is a large peninsula conventionally considered a continent in its own right because of its great physical size and the weight of its history and traditions. Europe is also considered a subcontinent of Eurasia and it is located enti ...

during the

Triassic The Triassic ( ) is a geologic period and system which spans 50.6 million years from the end of the Permian Period 251.902 million years ago (Mya), to the beginning of the Jurassic Period 201.36 Mya. The Triassic is the first and shortest period ...

and

Jurassic The Jurassic ( ) is a Geological period, geologic period and System (stratigraphy), stratigraphic system that spanned from the end of the Triassic Period million years ago (Mya) to the beginning of the Cretaceous Period, approximately Mya. The J ...

period.Triassic Holothurian Sclerites from Tatra Mountains
Krystyna Zawidzka. The type species is ''Calclamna germanica''.

References

Calclamnidae Triassic animals of Europe Triassic echinoderms Fossils of Poland Fossils of Germany Middle Triassic first appearances Early Jurassic extinctions Jurassic animals of Europe Jurassic echinoderms Fossil taxa described in 1955 {{paleo-holothuroidea-stub