Aaglacrinus

Aaglacrinus is an extinct species of crinoidea in the Cladia order. It has been proposed that it was a stationary (attached) suspension feeder the hard parts of which were composed of magnesium calcite. There are currently 2 species in this genus, both of which are under the name Aaglaocrinus: ...
Found on http://en.wikipedia.org/wiki/Aaglacrinus
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