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Crinoids like this evolved anal tubes and spines to deter parasites and predators such as snails and fish.
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Details
- Title: Crinoid
- Location: Des Moines County, Iowa, United States, North America
- Type: Fossil
- Rights: This image was obtained from the Smithsonian Institution. The image or its contents may be protected by international copyright laws. http://www.si.edu/termsofuse
- External Link: View this object record in the Smithsonian Institution Collections Search Center
- USNM Catalog Number(s): S6098
- Scientific Name: <i>Uperocrinus nashvillae</i>
- Photo Credit: Chip Clark, Smithsonian Institution National Museum of Natural History
- Geologic Age: Paleozoic - Mississippian - Lower/Early
- Field: Paleobiology
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