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Definitions for
"Blastoids"
Keywords:
stemlike
,
sedentary
,
extinct
,
circular
,
marine
Extinct group of sedentary marine animals that were anchored to the sea floor by a stemlike column of of circular plates
pbs.org
Keywords:
mississippian
,
fossilized
,
cup
,
stem
,
five
A Mississippian fossil consisting of a 1/2- to 1-inch cup-like body that was attached at the base to a short stem. Each of these bodies were five-sided and had arms radiating from it. Usually only the fossilized bodies are seen today.
nps.gov