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F1744 - Blastoid Fossil, In thumbnail, Indonesia.
Blastoids were small, stemmed echinoderms, abundant and
diverse in the Middle and Late Paleozoic. From about 500 to about 280
million years old. Usually it is only the globular theca (head), plates,
that are preserved. The Blastoids were filter feeders with fine, hair-like
feelers that waved about in the ocean waters extracting tiny particles which
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