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Genus Lingula
-Ordovician
-long pedicle, anchored it to the sea floor
-sessile
-thin, tongue shaped shell
-vertical burrows in intertidal areas
Genus Atrypa
-shells round to egg shaped, radial ridges
-"late Lower Silurian (Telychian) to the early Upper Devonian (Frasnian)"
Genus Composita
-Devonian to Permian
-smooth shell with fold
-round opening for pedicle
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