| Marsupites Temporal range: Santonian ~ | |
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| Marsupites testudinarius fossil | |
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Echinodermata |
| Class: | Crinoidea |
| Superorder: | Articulata |
| Order: | †Uintacrinida |
| Family: | †Marsupitidae |
| Genus: | †Marsupites Mantell in Miller, 1821 |
| Species | |
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Marsupites is an extinct genus of stalkless crinoids from the Santonian stage of the Late Cretaceous.
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:
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