''Aacocrinus'' is a genus of extinct
sea lily
Crinoids are marine animals that make up the class Crinoidea. Crinoids that are attached to the sea bottom by a stalk in their adult form are commonly called sea lilies, while the unstalked forms are called feather stars or comatulids, which are ...
from the
Actinocrinitidae (or
Patelliocrinidae) family. It has been shown that it was an attached stationary organism that blindly fed on
passing organism. It was composed of
Mg calcite and its habitat included the upper-level epifauna.
There are currently 14 species within this genus:
* ''
Aacocrinus acylus'' (Webster & Jell 1999)
* ''
Aacocrinus algeriaensis'' (Webster, Maples, Sevastopulo, Frest & Waters 2004)
* ''
Aacocrinus boonensis''
* ''
Aacocrinus chouteauensis''
* ''
Aacocrinus enigmaticus'' (Webster & Lane 1987)
* ''
Aacocrinus milleri''
* ''
Aacocrinus nododorsatus'' (Bowsher 1955)
* ''
Aacocrinus protuberoarmatus'' (Missouri)
* ''
Aacocrinus sampsoni''
* ''
Aacocrinus senectus''
* ''
Aacocrinus spinosulus''
* ''
Aacocrinus spinulosus''
* ''
Aacocrinus tetradactylus'' (Missouri)
* ''
Aacocrinus triarmatus''
References
Monobathrida
Paleozoic echinoderms
Prehistoric echinoderms of North America
{{paleo-crinoidea-stub