A family of extinct sea creatures belonging to the crinoid group, characterized by radiating arms and a cup-shaped body.
Scientific Latin, from actinocrin- (stem of actinocrinid) + -idae (taxonomic family suffix from Latin -id + Greek -ae, plural marker). Established in paleontological classification during the 19th century.
The Actinocrinidae family is a window into how nature experimented with symmetry—their radial body design with branching arms represented one evolutionary strategy in ancient seas, competing alongside completely different body plans that eventually outcompeted them.
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