Article · Wikipedia archive · Last revised Jul 16, 2026

Uintacrinus

Uintacrinus is an extinct genus of crinoids from the Cretaceous of Kansas. It was unusual among crinoids because it had no stalk, and probably floated above the seafloor. It lived in the Western Interior Seaway. This crinoid was a colonial animal with ten long arms each that it used to capture prey.

Last revised
Jul 16, 2026
Read time
≈ 1 min
Length
155 w
Citations
2
Source
Uintacrinus
Temporal range: Cretaceous
Uintacrinus socialis
Scientific classification Edit this classification
Kingdom: Animalia
Phylum: Echinodermata
Class: Crinoidea
Order: Uintacrinida
Family: Uintacrinidae
Genus: Uintacrinus
Species
  • Uintacrinus anglicus
  • Uintacrinus socialis

Uintacrinus ("crinoid from the Uinta Mountains") is an extinct genus of crinoids from the Cretaceous of Kansas. It was unusual among crinoids because it had no stalk, and probably floated above the seafloor.1 It lived in the Western Interior Seaway. This crinoid was a colonial animal with ten long arms each that it used to capture prey.2

Block at the AMNH preserving at least 65 U. socialis individuals. Collected in Kansas. source ↗
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