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Cryptoblastus
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Cryptoblastus, collected from the Burlington Limestone, Iowa
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Sea otter (Enhydra lutris), also called great sea otter, rare, completely marine otter of the northern Pacific, usually found in kelp beds. Floats on back. Looks like sea otter laughing. saltwater otters
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Paleozoic Era
fossil
Mississippian Subperiod
blastoid
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Cryptoblastus, collected from the Burlington Limestone, Iowa
Cryptoblastus, collected from the Burlington Limestone, Iowa

Cryptoblastus

fossil echinoderm genus
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History

Cryptoblastus, extinct genus of blastoids, a primitive group of echinoderms related to the modern sea lilies, found as fossils in Early Carboniferous marine rocks (the Early Carboniferous Period occurred from 360 to 320 million years ago).