- Modiolopsis
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extinct genus of pelecypods (clams) found as fossils in Ordovician rocks (505 to 438 million years old). Its form and structure is distinct, with a shell roughly elliptical in outline and broader at the margins. Markings on the shell consist of prominent growth lines in an arcuate or concentric pattern. Modiolopsis is a useful guide fossil for Ordovician rocks.
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Universalium. 2010.