Phacops rana milleriFrom the Devonian in Ohio
©
1998 Dr. Richard Paselk, Humboldt State University Natural History Museum
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Arthroacantha carpenteriFrom the Devonian in Ohio
©
1998 Dr. Richard Paselk, Humboldt State University Natural History Museum
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Hexagonaria percarinataFrom the Devonian in Michigan
©
1998 Dr. Richard Paselk, Humboldt State University Natural History Museum
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HexagonariaFrom the Devonian in Iowa
©
1998 Dr. Richard Paselk, Humboldt State University Natural History Museum
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Mucrospirifer prolificusFrom the Devonian in Ohio
©
1998 Dr. Richard Paselk, Humboldt State University Natural History Museum
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Philohedra sp. and Orthospirifer cooperiFrom the Devonian in Ohio
©
1998 Dr. Richard Paselk, Humboldt State University Natural History Museum
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CymtostrophiaFrom the Devonian in California
©
2004 UCMP
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FavositesFrom the Devonian in California
©
2004 UCMP
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StraparolusFrom the Devonian in California
©
2004 UCMP
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