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Devonian Fossil Gallery - Brachiopod
Brachiopoda, Articulata, Atrypidida
(Phylum, Class, Order)
Fossil identification by Jo Cox unless otherwise noted
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(Family)
Atrypa is found from the Silurian through the Devonian periods.
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#1 Atrypa reticularis Period: Devonian Stage: Frasnian Formation: Lime Creek Member: Cerro Gordo Location: Bird Hill, north central Iowa Collection: Jo Cox Size: 15 mm wide Identification: Charles Newsom, U. of Iowa |
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Description: This specimen is biconvex and reticulate. Anterior margin is straight. |
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#2 Atrypa reticularis Period: Devonian Stage: Frasnian Formation: Lime Creek Member: Cerro Gordo Location: Bird Hill, north central Iowa Collection: Jo Cox Size: 17 mm wide Identification: Charles Newsom, U. of Iowa |
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Description: This specimen is biconvex (pedicle valve is much flatter) and reticulate. Anterior margin has a deep sulcus on the pedicle valve, and a very slight fold on the brachial valve. |
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#3 Atrypa reticularis Period: Devonian Stage: Frasnian Formation: Lime Creek Member: Cerro Gordo Location: Bird Hill, north central Iowa Collection: Jo Cox Size: 20 mm wide Identification: Charles Newsom, U. of Iowa |
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Description: This specimen is biconvex (pedicle valve is much flatter). It is reticulate, but not as much as #1 & #2. Anterior margin has a shallow sulcus on the pedicle valve, and a very slight fold on the brachial valve. Reticulation is strongest at the margin of the fold and the center of the sulcus. |
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