eocrinoid

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The Colosseum, Rome, Italy. Giant amphitheatre built in Rome under the Flavian emperors. (ancient architecture; architectural ruins)

New Seven Wonders of the World

Washington DC.,USA, April 26, 1989. Supporters for and against legal abortion face off during a protest outside the United States Supreme Court Building during Webster V Health Services

Pro and Con: Abortion

Jackson (Wyoming, United States). Jackson Lake (also called Jackson Hole), southern end of the Teton Range (the Grand Tetons), Grand Teton National Park, Wyoming, USA

7 Wonders of America

Statue of Nostradamus

Nostradamus and His Prophecies

Groups of depositors in front of the closed American Union Bank, New York City. April 26, 1932. Great Depression run on bank crowd

Causes of the Great Depression

Click on image for enlargements of panel sections. The Ghent Altarpiece (open view) by Jan and Hubert van Eyck, 1432, polyptych with 12 panels, oil on panel; in the Cathedral of Saint-Bavon, Ghent, Belg.

The Most Stolen Work of Art

United States elections portal page linking to each election interactive

A History of U.S. Presidential Elections in Maps

eocrinoid

fossil echinoderm

Also known as: Eocrinoidea

Learn about this topic in these articles:

annotated classification

In echinoderm: Annotated classification
†Class Eocrinoidea Lower Cambrian to Silurian about 430,000,000–570,000,000 years ago; body usually consisting of stem, theca, and feeding brachioles. †Class Blastoidea Silurian to Permian about 280,000,000–430,000,000 years ago; stem, theca with 18–21 plates arranged in 4 rings; numerous feeding brachioles; distinctive infoldings of theca (hydrospires)
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