Marsupites

Marsupites; Temporal range: Santonian; ~86.3–83.6 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
	Marsupites testudinarius fossil
Scientific classification
Kingdom:	Animalia
Phylum:	Echinodermata
Subphylum:	Crinozoa
Class:	Crinoidea
Order:	Uintacrinida
Genus:	Marsupites
Species
	M. americanus Springer 1911; M. lamberti Besairie 1936; M. testudinarius Schlotheim 1820;

Marsupites is an extinct genus of crinoids from the Santonian stage of the Late Cretaceous.^[1]

Biostratigraphic significance

The International Commission on Stratigraphy (ICS) had provisionally assigned the extinction of Marsupites testudinarius as the defining biological marker for the start of the Campanian stage of the Late Cretaceous, 83.6 ± 0.2 million years ago, until a new final definition was eventually ratified in 2022, based instead primarily on magnetostratigraphy.

Fossils of the genus have been found in:^[1]

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