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Edrioblastoidea
fossil echinoderm class
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annotated classification
- In echinoderm: Annotated classification
†Class Edrioblastoidea Middle Ordovician about 375,000,000 years ago; stalked form with spheroidal theca; 5 well-developed food grooves. †Class Helicoplacoidea Lower Cambrian about 570,000,000 years ago; pear-shaped or spindle-shaped body with many plates arranged spirally. †Class Ophiocistioidea
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